a
FEATURES
150 MSPS Encode Rate
Low Input Capacitance: 17 pF
Low Power: 750 mW
–5.2 V Single Supply
MIL-STD-883 Compliant Versions Available
APPLICATIONS
Radar Systems
Digital Oscilloscopes/ATE Equipment
Laser/Radar Warning Receivers
Digital Radio
Electronic Warfare (ECM, ECCM, ESM)
Communication/Signal Intelligence
High-Speed 8-Bit
Monolithic A/D Converter
AD9002
FUNCTIONAL BLOCK DIAGRAM
OVERFLOW
INHIBIT
ANALOG IN
R
+V
REF
R
255
256
AD9002
OVERFLOW
BIT 8 (MSB)
D
E
C
O
D
I
N
G
L
O
G
I
C
BIT 7
BIT 6
BIT 5
R
128
R/2
REF
MID
R/2
127
L
A
T
C
H
BIT 4
BIT 3
R
GENERAL DESCRIPTION
2
BIT 2
BIT 1 (LSB)
The AD9002 is an 8-bit, high-speed, analog-to-digital converter.
The AD9002 is fabricated in an advanced bipolar process that
allows operation at sampling rates in excess of 150 megasamples/
second. Functionally, the AD9002 is comprised of 256 parallel
comparator stages whose outputs are decoded to drive the ECL
compatible output latches.
An exceptionally wide large signal analog input bandwidth of
160 MHz is due to an innovative comparator design and very
close attention to device layout considerations. The wide input
bandwidth of the AD9002 allows very accurate acquisition of
high speed pulse inputs, without an external track-and-hold.
The comparator output decoding scheme minimizes false codes,
which is critical to high speed linearity.
The AD9002 provides an external hysteresis control pin that
can be used to optimize comparator sensitivity to further improve
performance. Additionally, the AD9002’s low power dissipation
of 750 mW makes it usable over the full extended temperature
range. The AD9002 also incorporates an overflow bit to indicate
overrange inputs. This overflow output can be disabled with the
overflow inhibit pin.
R
–V
REF
ENCODE
ENCODE
GND
HYSTERESIS
–V
S
1
The AD9002 is available in two grades, one with 0.5 LSB linearity
and one with 0.75 LSB linearity. Both versions are offered in an
industrial grade, –25°C to +85°C, packaged in a 28-lead DIP
and a 28-leaded JLCC. The military temperature range devices,
–55°C to +125°C, are available in ceramic DIP and LCC pack-
ages and comply with MIL-STD-883 Class B.
REV. F
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
AD9002–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(–V = –5.2 V; Differential Reference Voltage = 2.0 V; unless otherwise noted)
S
Parameter
RESOLUTION
DC ACCURACY
Differential Linearity
Integral Linearity
No Missing Codes
INITIAL OFFSET ERROR
Top of Reference Ladder
Bottom of Reference Ladder
Offset Drift Coefficient
ANALOG INPUT
Input Bias Current
1
Input Resistance
Input Capacitance
Large Signal Bandwidth
2
Input Slew Rate
3
REFERENCE INPUT
Reference Ladder Resistance
Ladder Temperature Coefficient
Reference Input Bandwidth
DYNAMIC PERFORMANCE
Conversion Rate
Aperture Delay
Aperture Uncertainty (Jitter)
Output Delay (t
PD
)
4, 5
Transient Response
6
Overvoltage Recovery Time
7
Output Rise Time
4
Output Fall Time
4
Output Time Skew
4, 8
ENCODE INPUT
Logic “1” Voltage
4
Logic “0” Voltage
4
Logic “1” Current
Logic “0” Current
Input Capacitance
Encode Pulsewidth (Low)
9
Encode Pulsewidth (High)
9
OVERFLOW INHIBIT INPUT
0 V Input Current
AC LINEARITY
10
Effective Bits
11
In-Band Harmonics
dc to 1.23 MHz
dc to 9.3 MHz
dc to 19.3 MHz
Signal-to-Noise Ratio
12
Two Tone Intermod Rejection
13
DIGITAL OUTPUTS
4
Logic “1” Voltage
Logic “0” Voltage
POWER SUPPLY
14
Supply Current (–5.2 V)
Nominal Power Dissipation
Reference Ladder Dissipation
Power Supply Rejection Ratio
15
Temp
AD9002AD/AJ
Min
Typ
Max
8
AD9002BD/BJ
Min
Typ
Max
8
AD9002SD/SE
Min
Typ
Max
8
AD9002TD/TE
Min
Typ
Max
8
Unit
Bits
25°C
Full
25°C
Full
Full
25°C
Full
25°C
Full
Full
25°C
Full
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Full
Full
Full
Full
25°C
25°C
25°C
Full
25°C
25°C
25°C
25°C
25°C
25°C
Full
Full
25°C
Full
25°C
25°C
25°C
0.75
1.0
0.6
1.0
1.2
GUARANTEED
8
4
20
60
25
200
17
160
440
80
0.25
10
150
1.3
15
3.7
6
6
0.6
–1.1
–1.5
150
120
3
1.5
1.5
144
7.6
48
46
55
50
44
47.6
60
300
200
200
14
17
10
12
0.6
0.5
0.75
0.4
0.5
1.2
GUARANTEED
8
4
20
60
25
200
17
160
440
80
0.25
10
150
1.3
15
3.7
6
6
0.6
–1.1
–1.5
150
120
3
1.5
1.5
144
7.6
48
46
55
50
44
47.6
60
300
200
200
14
17
10
12
0.4
0.75
1.0
0.6
1.0
1.2
GUARANTEED
8
4
20
60
25
200
17
160
440
80
0.25
10
150
1.3
15
3.7
6
6
0.6
–1.1
–1.5
150
120
3
1.5
1.5
144
7.6
48
46
55
50
44
47.6
60
300
200
200
14
17
10
12
0.6
0.5
0.75
0.4
0.5
1.2
GUARANTEED
8
4
20
60
25
200
17
160
440
80
0.25
10
150
1.3
15
3.7
6
6
0.6
–1.1
–1.5
150
120
3
1.5
1.5
144
7.6
48
46
55
50
44
47.6
60
300
200
200
22
14
17
10
12
0.4
LSB
LSB
LSB
LSB
mV
mV
mV
mV
µV/°C
µA
µA
kΩ
pF
MHz
V/µs
Ω
Ω/°C
MHz
MSPS
ns
ps
ns
ns
ns
ns
ns
ns
V
V
µA
µA
pF
ns
ns
µA
Bits
dB
dB
dB
dB
dB
V
V
mA
mA
mW
mW
mV/V
22
22
22
40
110
40
110
40
110
40
110
125
2.5
125
5.5
3.0
2.5
2.5
125
5.5
3.0
2.5
2.5
125
5.5
3.0
2.5
2.5
5.5
3.0
2.5
–1.1
–1.5
145
750
50
0.8
175
200
1.5
–1.1
–1.5
145
750
50
0.8
9
–1.1
–1.5
145
750
50
0.8
175
200
1.5
–1.1
–1.5
145
750
50
0.8
175
200
1.5
175
200
1.5
NOTES
1
Measured with AIN = 0 V.
2
Measured by FFT analysis where fundamental is –3 dBc.
3
Input slew rate derived from rise time (10 to 90%) of full scale input.
4
0utputs terminated through 100
Ω
to –2 V.
5
Measured from ENCODE in to data out for LSB only.
6
For full-scale step input, 8-bit accuracy is attained in specified time.
7
Recovers to 8-bit accuracy in specified time after 150% full-scale input overvoltage.
8
Output time skew includes high-to-low and low-to-high transitions as well as
bit-to-bit time skew differences.
ENCODE signal rise/fall times should be less than 10 ns for normal operation.
10
Measured at 125 MSPS encode rate.
11
Analog input frequency = 1.23 MHz.
12
RMS signal to rms noise, with 1.23 MHz analog input signal.
13
Input signals 1 V p-p @ 1.23 MHz and 1 V p-p @ 2.30 MHz.
14
Supplies should remain stable within
±
5% for normal operation.
15
Measured at –5.2 V
±
5%.
Specifications subject to change without notice.
–2–
REV. 0
AD9002
ABSOLUTE MAXIMUM RATINGS
1
Recommended Operating Conditions
Supply Voltage (–V
S
) . . . . . . . . . . . . . . . . . . . . . . . . . . . –6 V
Analog-to-Digital Supply Voltage Differential . . . . . . . . 0.5 V
Analog Input Voltage . . . . . . . . . . . . . . . . . . . . –V
S
to +0.5 V
Digital Input Voltage . . . . . . . . . . . . . . . . . . . . . . . –V
S
to 0 V
Reference Input Voltage (+V
REF
– V
REF
)
2
. . . –3.5 V to +0.1 V
Differential Reference Voltage . . . . . . . . . . . . . . . . . . . . 2.1 V
Reference Midpoint Current . . . . . . . . . . . . . . . . . . . .
±
4 mA
ENCODE to
ENCODE
Differential Voltage . . . . . . . . . . . 4 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature Range
AD9002AD/BD/AJ/BJ . . . . . . . . . . . . . . . –25°C to +85°C
AD9002SE/SD/TD/TE . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature
3
. . . . . . . . . . . . . . . . . . . . . . . . 150°C
Lead Soldering Temperature (10 sec) . . . . . . . . . . . . . 300°C
NOTES
1
Absolute maximum ratings are limiting values, to be applied individually, and
beyond which the serviceability of the circuit may be impaired. Functional
operability under any of these conditions is not necessarily implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect device
reliability.
2
+V
REF
≥
–V
REF
under all circumstances.
3
Maximum junction temperature (t
J
max) should not exceed 175°C for ceramic
packages, and 150°C for plastic packages:
t
J
= PD (θ
JA
) + t
A
PD (θ
JC
) + t
C
where
PD = power dissipation
θ
JA
= thermal impedance from junction to ambient (°C/W)
θ
JC
= thermal impedance from junction to case (°C/W)
t
A
= ambient temperature (°C)
t
C
= case temperature (°C)
Typical thermal impedances are:
Ceramic DIP
θ
JA
= 56°C/W;
θ
JC
= 20°C/W
Ceramic LCC
θ
JA
= 69°C/W;
θ
JC
= 23°C/W
PLCC
θ
JA
= 60°C/W;
θ
JC
= 19°C/W.
Input Voltage
Parameter
–V
S
+V
REF
–V
REF
Analog Input
Min
–5.46
–V
REF
–2.1
–V
REF
Nominal
–5.20
0.0 V
–2.0
Max
–4.94
+0.1
+V
REF
+V
REF
EXPLANATION OF TEST LEVELS
Test Level I
Test Level II
– 100% production tested.
– 100% production tested at 25°C, and sample
tested at specified temperatures.
Test Level III – Sample tested only.
Test Level IV – Parameter is guaranteed by design and
characterization testing.
Test Level V – Parameter is a typical value only.
Test Level VI – All devices are 100% production tested at
25°C. 100% production tested at temperature
extremes for extended temperature devices;
sample tested at temperature extremes for
commercial/industrial devices.
ORDERING GUIDE
Model
AD9002AD
AD9002BD
AD9002AJ
AD9002BJ
AD9002SD/883B
AD9002SE/883B
AD9002TD/883B
AD9002TE/883B
Package
Linearity Temperature Range Option*
0.75 LSB
0.50 LSB
0.75 LSB
0.50 LSB
0.75 LSB
0.75 LSB
0.50 LSB
0.50 LSB
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
D-28
D-28
J-28
J-28
D-28
E-28A
D-28
E-28A
*D
= Ceramic DIP; E = Leadless Ceramic Chip Carrier; J = Ceramic Chip
Carrier, J-Formed Leads.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD9002 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. F
–3–
AD9002
FUNCTIONAL DESCRIPTION
Pin #
1
2
Mnemonic
DIGITAL GROUND
OVERFLOW INH
Description
One of four digital ground pins. All digital ground pins should be connected together.
OVERFLOW INHIBIT controls the data output polarity for overvoltage inputs.
Overflow Enabled
(Floating or –5.2 V)
of D1–D8
1 0 0 0 0 0 0 0 0
0 X X X X X X X X
Analog Input
V
IN
> +V
REF
V
IN
≤
+V
REF
3
4
5
6
7
8
9
10
11
12
13
14
15
16–19
20
21, 22
23
24, 25
26
27
HYSTERESIS
+V
REF
ANALOG INPUT
ANALOG GROUND
ENCODE
ENCODE
ANALOG GROUND
ANALOG INPUT
–V
REF
REF
MID
DIGITAL GROUND
DIGITAL –V
S
D1 (LSB)
D2–D5
DIGITAL GROUND
ANALOG –V
S
DIGITAL GROUND
D6, D7
D8 (MSB)
OVERFLOW
Overflow Inhibited (GND)
of D1–D8
0 1 1 1 1 1 1
1 1
0 X X X X X X X X
The Hysteresis control voltage varies the comparator hysteresis from 0 mV to 10 mV, for a change
from –5.2 V to –2.2 V at the Hysteresis control pin. Normally converted to –5.2 V.
The most positive reference voltage for the internal resistor ladder.
One of two analog input pins. Both analog input pins should be connected together.
One of two analog ground pins. Both analog ground pins should be connected together.
Noninverted input of the differential encode input. This pin is driven in conjunction with
ENCODE.
Data is latched on the rising edge of the ENCODE signal.
Inverted input of the differential encode input. This pin is driven in conjunction with ENCODE.
One of two analog ground pins. Both analog ground pins should be connected together.
One of two analog input pins. Both analog inputs should be connected together.
The most negative reference voltage for the internal resistor ladder.
The midpoint tap on the internal resistor ladder.
One of four digital ground pins. All digital ground pins should be connected together.
One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be con-
nected together.
Digital Data Output
Digital Data Output
One of four digital ground pins. All digital ground pins should be connected together.
One of two negative analog supply pins (nominally –5.2 V). Both analog supply pins should be con-
nected together
One of four digital ground pins. All digital ground pins should be connected together.
Digital Data Output
Digital Data Output
Overflow data output. Logic high indicates an input overvoltage (V
IN
> +V
REF
) if OVERFLOW
INHIBIT is enabled (overflow enabled, –5.2 V). See OVERFLOW INHIBIT.
28
DIGITAL –V
S
One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be
connected together.
PIN DESIGNATIONS
DIP
DIGITAL
1
GROUND
OVERFLOW INH
2
HYSTERESIS
3
+V
REF 4
ANALOG INPUT
5
ANALOG
6
GROUND
ENCODE
7
28
DIGITAL –V
S
27
OVERFLOW
LCC
DIGITAL GROUND
DIGITAL –V
S
OVERFLOW
D8(MSB)
HYSTERESIS
OVERFLOW INH
JLCC
DIGITAL GROUND
ANALOG –V
S
DIGITAL GROUND
D7
D6
24
D6
23
DIGITAL
4
3
2
1 28 27 26
25 24 23 22 21 20 19
D5
18
17
25
D7
+V
REF
26
D8(MSB)
ANALOG –V
S
AD9002
GROUND
TOP VIEW
ENCODE
8
(Not to Scale)
21
ANALOG –V
S
ANALOG
9
20
DIGITAL
GROUND
GROUND
19
D5
ANALOG INPUT
10
–V
REF 11
REF
MID 12
DIGITAL
13
GROUND
DIGITAL –V
S 14
18
D4
17
D3
16
D2
15
D1(LSB)
22
ANALOG –V
S
ANALOG INPUT
5
ANALOG
GROUND
6
ENCODE
7
ENCODE
8
ANALOG
9
GROUND
ANALOG INPUT
10
–V
REF 11
25
24
AD9002
TOP VIEW
(Not to Scale)
23
22
21
20
19
D7
D6
DIGITAL
GROUND
ANALOG –V
S
ANALOG –V
S
DIGITAL
GROUND
D5
D8(MSB)
OVERFLOW
DIGITAL –V
S
DIGITAL
GROUND
OVERFLOW INH
HYSTERESIS
+V
REF
26
27
28
1
2
3
4
5
6
7
8
9
10
11
D4
D3
D2
D1(LSB)
DIGITAL –V
S
DIGITAL
GROUND
REF
MID
AD9002
TOP VIEW
(Not to Scale)
16
15
14
13
12
DIGITAL GROUND
DIGITAL –V
S
–4–
ENCODE
ANALOG GROUND
ANALOG INPUT
–V
REF
ANALOG GROUND
ANALOG INPUT
ENCODE
12 13 14 15 16 17 18
REF
MID
D1(LSB)
D2
D3
D4
REV. F
AD9002
N+1
ANALOG
INPUT
N
APERTURE
DELAY
ENCODE
N+2
t
PD
OUTPUT
DATA
N–1
N
N+1
Figure 1. Timing Diagram
AD9002
AD9002
+V
REF
R
AD9002
R/2
ENCODE
ENCODE
ANALOG
INPUT
–5.2V
–5.2V
R/2
DIGITAL
OUTPUT
R
–V
REF
REF
MID
–5.2V
–5.2V
–5.2V
COMPARATOR CELLS
Figure 2. Input/Output Circuits
OVERFLOW
INHIBIT
HYSTERESIS
DIGITAL
GROUND
0.1 F
–5.2V
–V
S
HYSTERESIS
OVERFLOW INH
100
AD1
AD2
1k
AD3
–2V
0.1 F
+V
REF
GROUND
1k
ANALOG IN
ENCODE
ENCODE
–V
REF
OVERFLOW
D8
D7
D6
D5
D4
DIGITAL –V
S
OVERFLOW
D8 (MSB)
+V
REF
1k
1k
1k
1k
1k
1k
1k
1k
D2
1k
D1
ANALOG
INPUT
ANALOG
GROUND
ENCODE
ENCODE
ANALOG
GROUND
ANALOG
INPUT
D7
D6
DIGITAL
GROUND
ANALOG –V
S
DIGITAL
GROUND
AD9002
D3
D5
D4
STATIC BURN IN
AD1 = 0V
AD2 = ECL HIGH
DYNAMIC BURN IN
AD1
AD3 = ECL LOW
0V
–2V
ECL HIGH
ECL LOW
ECL HIGH
–V
REF
D1 (LSB)
DIGITAL
GROUND DIGITAL
REF
MID
–V
S
D2
D3
AD2
Figure 4. Die Layout and Mechanical Information
AD3
ALL RESISTORS 5%,
ALL CAPACITORS 20%,
ALL SUPPLIES 5%
ECL LOW
F
Figure 3. Burn-in Diagram
Die Dimensions . . . . . . . . . . . . . . . . . 106
×
114
×
15 (± 2) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
×
4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –V
S
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Nitride
Die Attach . . . . . . . . . . . . . . . . . . . . . Gold Eutectic (Ceramic)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Epoxy (Plastic)
Bond Wire . . . . . . . . . . . . . 1-1.3 mil Gold; Gold Ball Bonding
–5–
REV. F
PCB设计
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