19-1133; Rev 0; 10/96
KIT
ATION
EVALU
E
BL
AVAILA
12-Bit, 20Msps, TTL-Output ADC
_____________________________Features
o
Monolithic, 12-Bit, 20Msps Converter
o
On-Chip Track/Hold
o
±2.0V Analog Input Range
o
66dB SNR at 1MHz Input
o
Low Power: 1.1W
o
5pF Input Capacitance
o
TTL-Compatible Outputs
_________________General Description
The MAX1171 analog-to-digital converter (ADC) is a
12-bit monolithic ADC capable of sample rates greater
than 20Msps. An on-board input buffer and track/hold
function ensure excellent dynamic performance without
the need for external components. A 5pF input capaci-
tance minimizes development problems.
Logic inputs and outputs are TTL compatible. An over-
range output signal is provided to indicate overflow
conditions. Output data format is straight binary. Power
dissipation is a very low 1.1W with power-supply volt-
ages of +5.0V and -5.2V. The MAX1171 also provides a
wide input voltage range of ±2.0V.
The MAX1171 is available in a 32-lead ceramic side-
brazed package and a 44-lead surface-mount CERQUAD
package.
MAX1171
________________Ordering Information
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
32 Ceramic SB
44 CERQUAD
_________________________Applications
Radar Receivers
Professional Video
Instrumentation
Imaging
Digital Communications
Digital Spectrum Analyzers
MAX1171CDJ
MAX1171CBH
___________________Pin Configurations
D1
D0
N.C.
DGND
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
________________Functional Diagram
V
IN
INPUT
BUFFER
4-BIT FLASH CONVERTER
4
ERROR
CORRECTION,
DECODING
12
AND
OUTPUT TLL
DRIVERS
DIGITAL
OUTPUT
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
N.C.
1
2
3
4
5
6
7
8
9
10
11
DV
CC
V
EE
N.C.
AGND
N.C.
V
CC
N.C.
TOP VIEW
MAX1171
N.C.
VFB
VSB
VRT1
VRT2
VIN
VRT3
VST
VFT
N.C.
V
CC
12
13
14
15
16
17
18
19
20
21
N.C.
D12
DGND
DV
CC
ANALOG GAIN
COMPRESSION
PROCESSOR
TRACK/
HOLD
AMPLIFIERS
ASYNCHRONOUS
8-BIT SAR
8
CERQUAD
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
N.C.
CLK
N.C.
V
EE
N.C.
AGND
N.C.
22
1
For the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
12-Bit, 20Msps, TTL-Output ADC
MAX1171
ABSOLUTE MAXIMUM RATINGS
V
CC
.......................................................................................+6V
V
EE
.........................................................................................-6V
Analog Input ........................................................V
FB
≤
V
IN
≤
V
FT
VFB, VFT ................................................................. -3.0V, +3.0V
Reference Ladder Current ..................................................12mA
CLK IN ...................................................................................V
CC
Digital Outputs.......................................................0mA to -30mA
Operating Temperature Range...............................0°C to +70°C
Junction Temperature (T
j
)................................................+175°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +5.0V, V
EE
= -5.2V, DV
CC
= +5.0V, V
IN
= ±2.0V, V
SB
= -2.0V, V
ST
= +2.0V, f
CLK
= 20MHz, 50% clock duty cycle,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Resolution
DC ACCURACY
(T
A
= +25°C)
Integral Nonlinearity
Differential Nonlinearity
No Missing Codes
ANALOG INPUT
Input Voltage Range
Input Bias Current
Input Resistance
Input Capacitance
Input Bandwidth
Positive Full-Scale Error
Negative Full-Scale Error
REFERENCE INPUT
Reference Ladder Resistance
Reference Ladder Tempco
TIMING CHARACTERISTICS
Maximum Conversion Rate
Overvoltage Recovery Time
Pipeline Delay (Latency)
Output Delay
Aperture Delay Time
Aperture Jitter Time
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
VI
V
VI
V
V
V
14
1
5
20
20
1
18
MHz
ns
Clock
Cycle
ns
ns
ps-RMS
VI
V
500
800
0.8
Ω
Ω/°C
3dB small signal
T
A
= +25°C
V
IN
= 0V, T
A
= +25°C
VI
I
I
V
V
V
V
100
±2.0
30
300
5
120
±5.0
±5.0
60
V
µA
kΩ
pF
MHz
LSB
LSB
± full scale
250kHz sample rate
IV
IV
I
±2.0
±0.8
Guaranteed
LSB
LSB
CONDITIONS
TEST
LEVEL
MIN
12
TYP
MAX
UNITS
Bits
2
_______________________________________________________________________________________
12-Bit, 20Msps, TTL-Output ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5.0V, V
EE
= -5.2V, DV
CC
= +5.0V, V
IN
= ±2.0V, V
SB
= -2.0V, V
ST
= +2.0V, f
CLK
= 20MHz, 50% clock duty cycle,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
DYNAMIC PERFORMANCE
f
IN
= 500kHz
Effective Number of Bits
f
IN
= 1MHz
f
IN
= 3.58MHz
f
IN
= 500kHz
Signal-to-Noise Ratio
(without Harmonics)
f
IN
= 1MHz
f
IN
= 3.58MHz
f
IN
= 500kHz
Harmonic Distortion
f
IN
= 1MHz
f
IN
= 3.58MHz
f
IN
= 500kHz
Signal-to-Noise and Distortion
f
IN
= 1MHz
f
IN
= 3.58MHz
Spurious-Free Dynamic Range
Differential Phase
Differential Gain
DIGITAL INPUTS
Logic "1" Voltage
Logic "0" Voltage
Maximum Input Current Low
Maximum Input Current High
Pulse Width Low (CLK)
Pulse Width High (CLK)
DIGITAL OUTPUTS
Logic "1" Voltage
Logic "0" Voltage
T
A
= +25°C
T
A
= +25°C
I
I
2.4
0.6
V
V
T
A
= +25°C
T
A
= +25°C
V
V
I
I
IV
IV
0
0
20
20
300
5
5
2.4
4.0
0.8
20
20
V
V
µA
µA
ns
ns
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
I
IV
I
IV
I
IV
I
IV
I
IV
I
IV
I
IV
I
IV
I
IV
V
V
V
64
58
64
58
62
58
63
59
63
59
59
57
60
55
60
55
57
54
10.2
10.0
9.5
67
61
66
60
64
60
66
62
65
61
61
59
63
58
62
57
59
56
74
0.2
0.7
dBc
Degrees
%
dB
dB
dB
Bits
CONDITIONS
TEST
LEVEL
MIN
TYP
MAX
UNITS
MAX1171
f
IN
= 1MHz, T
A
= +25°C
f
IN
= 3.58MHz and 4.35MHz,
T
A
= +25°C
f
IN
= 3.58MHz and 4.35MHz,
T
A
= +25°C
_______________________________________________________________________________________
3
12-Bit, 20Msps, TTL-Output ADC
MAX1171
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5.0V, V
EE
= -5.2V, DV
CC
= +5.0V, V
IN
= ±2.0V, V
SB
= -2.0V, V
ST
= +2.0V, f
CLK
= 20MHz, 50% clock duty cycle,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
POWER-SUPPLY REQUIREMENTS
V
CC
Voltages
DV
CC
-V
EE
I
CC,
T
A
= +25°C
Currents
Power Dissipation
Power-Supply Rejection
5V ±0.25V, -5.2V ±0.25V
DI
CC,
T
A
= T
MIN
to T
MAX
-I
EE,
T
A
= +25°C
IV
IV
IV
I
IV
I
VI
V
4.75
4.75
-4.95
5.0
5.0
-5.2
135
40
45
1.1
1.0
5.25
5.25
-5.45
150
55
70
1.3
W
LSB
mA
V
CONDITIONS
TEST
LEVEL
MIN
TYP
MAX
UNITS
Note 1:
Typical thermal impedances (unsoldered, in free air):
32 Ceramic SB:
θj
A
= 50°C/W
44 CERQUAD:
θj
A
= 78°C/W,
θj
A
at 1m/s airflow = 58°C/W,
θj
C
= 3.3°C/W
Use forced-air cooling or heatsinking to maintain T
j
≤
150°C.
TEST LEVEL CODES
All electrical characteristics are subject to the
following conditions:
All parameters having min/max specifications
are guaranteed. The Test Level column indi-
cates the specific device testing actually per-
formed during production and Quality
Assurance inspection. Any blank section in the
data column indicates that the specification is
not tested at the specified condition.
Unless otherwise noted, all tests are pulsed;
therefore, T
j
= T
C
= T
A
.
TEST LEVEL
I
II
III
IV
V
VI
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at T
A
= +25°C, and sample tested at the
specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design and charac-
terization data.
Parameter is a typical value for information purposes only.
100% production tested at T
A
= +25°C. Parameter is guaranteed
over specified temperature range.
4
_______________________________________________________________________________________
12-Bit, 20Msps, TTL-Output ADC
__________________________________________Typical Operating Characteristics
(f
S
= 20Msps, f
IN
= 1MHz, T
A
= +25°C, unless otherwise noted.)
SIGNAL-TO-NOISE RATIO
vs. INPUT FREQUENCY
MAX1170 TOC-01
MAX1171
TOTAL HARMONIC DISTORTION
vs. INPUT FREQUENCY
MAX1170 TOC-02
SNR, THD, SINAD vs. SAMPLE RATE
MAX1170 TOC-03
80
70
60
SNR (dB)
80
70
60
THD (dB)
50
40
30
20
80
70
SNR, THD, SINAD (dB)
60
50
40
30
20
SNR, THD
SINAD
50
40
30
20
0.1
1
INPUT FREQUENCY (MHz)
10
0.1
1
INPUT FREQUENCY (MHz)
10
1
10
SAMPLE RATE (Msps)
100
SIGNAL-TO-NOISE AND DISTORTION
vs. INPUT FREQUENCY
MAX1170 TOC-04
SPECTRAL RESPONSE
MAX1170 TOC-05
SNR, THD, SINAD vs. TEMPERATURE
MAX1170 TOC-06
80
70
60
50
40
30
20
0.1
1
INPUT FREQUENCY (MHz)
0
75
SNR, THD, SINAD (dB)
-30
AMPLITUDE (dB)
SINAD (dB)
70
SNR
65
THD
60
SINAD
-60
-90
55
-120
10
0
1
2
3
FREQUENCY (MHz)
4
5
50
-25
0
50
25
TEMPERATURE (°C)
75
_______________________________________________________________________________________
5
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