FEATURES
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LTC1603
High Speed, 16-Bit, 250ksps
Sampling A/D Converter
with Shutdown
DESCRIPTIO
The LTC
®
1603 is a 250ksps, 16-bit sampling A/D con-
verter that draws only 220mW from
±5V
supplies. This
high performance device includes a high dynamic range
sample-and-hold, a precision reference and a high speed
parallel output. Two digitally selectable power shutdown
modes provide power savings for low power systems.
The LTC1603’s full-scale input range is
±
2.5V. Outstand-
ing AC performance includes 90dB S/(N+D) and – 100dB
THD at a sample rate of 250ksps.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 15MHz
bandwidth. The 68dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has
µP
compatible,16-bit parallel output port.
There is no pipeline delay in conversion results. A separate
convert start input and a data ready signal (BUSY) ease
connections to FlFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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A Complete, 250ksps 16-Bit ADC
90dB S/(N+D) and –100dB THD (Typ)
Power Dissipation: 220mW (Typ)
Nap (7mW) and Sleep (10
µ
W) Shutdown Modes
No Pipeline Delay
No Missing Codes over Temperature
Operates with Internal 15ppm/°C Reference
or External Reference
True Differential Inputs Reject Common Mode Noise
5MHz Full Power Bandwidth
±2.5V
Bipolar Input Range
Pin Compatible with LTC1604 and LTC1608
36-Pin SSOP Package
APPLICATIO S
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Telecommunications
Digital Signal Processing
Multiplexed Data Acquisition Systems
High Speed Data Acquisition
Spectrum Analysis
Imaging Systems
TYPICAL APPLICATIO
2.2µF
10µF
10Ω
36
5V 10µF
5V
10µF
3
V
REF
+
35
AV
DD
+
9
+
10
DGND
SHDN
33
CS
32
CONVST
31
RD
30
BUSY
27
OV
DD
29
5V OR
3V
10µF
µP
CONTROL
LINES
AV
DD
DV
DD
4
REFCOMP
7.5k
1.75X
+
47µF
4.375V
2.5V
REF
CONTROL
LOGIC
AND
TIMING
1
A
IN+
DIFFERENTIAL
ANALOG INPUT
±2.5V
2
A
IN–
+
–
OGND 28
16-BIT
SAMPLING
ADC
AGND
5
AGND
6
B15 TO B0
OUTPUT
BUFFERS
16-BIT
PARALLEL
BUS
11 TO 26
1603 TA01
D15 TO D0
AGND
7
AGND V
SS
8
34
+
–5V
10µF
+
U
U
U
1603f
1
LTC1603
ABSOLUTE
MAXIMUM
RATINGS
AV
DD
= DV
DD
= OV
DD
= V
DD
(Notes 1, 2)
PACKAGE/ORDER INFORMATION
TOP VIEW
A
IN+
A
IN–
V
REF
REFCOMP
AGND
AGND
AGND
AGND
DV
DD
1
2
3
4
5
6
7
8
9
36 AV
DD
35 AV
DD
34 V
SS
33 SHDN
32 CS
31 CONV
30 RD
29 OV
DD
28 OGND
27 BUSY
26 D0
25 D1
24 D2
23 D3
22 D4
21 D5
20 D6
19 D7
G PACKAGE
36-LEAD PLASTIC SSOP
Supply Voltage (V
DD
) ................................................ 6V
Negative Supply Voltage (V
SS
) ............................... – 6V
Total Supply Voltage (V
DD
to V
SS
) .......................... 12V
Analog Input Voltage
(Note 3) ......................... (V
SS
– 0.3V) to (V
DD
+ 0.3V)
V
REF
Voltage (Note 4) ................. – 0.3V to (V
DD
+ 0.3V)
REFCOMP Voltage (Note 4) ......... – 0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4) ....................– 0.3V to 10V
Digital Output Voltage .................. – 0.3V to (V
DD
+ 0.3V)
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1603C .............................................. 0°C to 70°C
LTC1603I ............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER
PART NUMBER
LTC1603CG
LTC1603IG
DGND 10
D15 (MSB) 11
D14 12
D13 13
D12 14
D11 15
D10 16
D9 17
D8 18
T
JMAX
= 125°C,
θ
JA
= 95°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
CO VERTER CHARACTERISTICS
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Transition Noise
Offset Error
Offset Tempco
Full-Scale Error
Full-Scale Tempco
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. With Internal Reference (Notes 5, 6)
CONDITIONS
q
MIN
16
q
TYP
16
±1
0.7
±0.05
0.5
±0.125
±15
MAX
±3
±0.125
±0.25
±0.25
UNITS
Bits
LSB
LSB
%
ppm/°C
%
%
ppm/°C
(Note 7)
(Note 8)
(Note 9)
(Note 9)
Internal Reference
External Reference
I
OUT
(Reference) = 0, Internal Reference
q
A ALOG I PUT
The
q
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C.
SYMBOL PARAMETER
V
IN
I
IN
C
IN
t
ACQ
t
AP
t
jitter
CMRR
Analog Input Range (Note 2)
Analog Input Leakage Current
Analog Input Capacitance
Sample-and-Hold Acquisition Time
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Time Jitter
Analog Input Common Mode Rejection Ratio
– 2.5V < (A
IN–
= A
IN+
) < 2.5V
CONDITIONS
4.75
≤
V
DD
≤
5.25V, – 5.25
≤
V
SS
≤
– 4.75V,
V
SS
≤
(A
IN–
, A
IN+
)
≤
AV
DD
CS = High
Between Conversions
During Conversions
q
MIN
TYP
±2.5
MAX
UNITS
V
±1
43
5
380
– 1.5
5
68
ps
RMS
dB
1603f
2
U
W
U
U
W W
W
U
U
U
µA
pF
pF
ns
ns
LTC1603
DY A IC ACCURACY
The
q
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL PARAMETER
S/N
Signal-to-Noise Ratio
CONDITIONS
5kHz Input Signal
100kHz Input Signal
5kHz Input Signal
100kHz Input Signal (Note 10)
5kHz Input Signal
100kHz Input Signal
100kHz Input Signal
f
IN1
= 29.37kHz, f
IN2
= 32.446kHz
q
S/(N + D) Signal-to-(Noise + Distortion) Ratio
THD
SFDR
IMD
Total Harmonic Distortion
Up to 5th Harmonic
Spurious Free Dynamic Range
Intermodulation Distortion
Full Power Bandwidth
Full Linear Bandwidth (S/(N + D)
≥
84dB
I TER AL REFERE CE CHARACTERISTICS
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
V
REF
Line Regulation
V
REF
Output Resistance
REFCOMP Output Voltage
CONDITIONS
I
OUT
= 0
I
OUT
= 0
4.75
≤
V
DD
≤
5.25V
– 5.25V
≤
V
SS
≤
– 4.75V
0
≤ I
OUT
≤
1mA
I
OUT
= 0
DIGITAL I PUTS A D DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
C
OZ
I
SOURCE
I
SINK
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage D15 to D0
Hi-Z Output Capacitance D15 to D0
Output Source Current
Output Sink Current
CONDITIONS
V
DD
= 5.25V
V
DD
= 4.75V
V
IN
= 0V to V
DD
The
q
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
q
q
q
U
U
U
W U
U
MIN
87
TYP
90
90
90
89
– 100
– 94
96
– 88
5
350
MAX
UNITS
dB
dB
dB
dB
q
q
84
– 88
dB
dB
dB
dB
MHz
kHz
U
(Note 5)
MIN
2.475
TYP
2.500
±15
0.01
0.01
7.5
4.375
MAX
2.515
UNITS
V
ppm/°C
LSB/V
LSB/V
kΩ
V
TYP
MAX
0.8
±1
0
UNITS
V
V
µA
pF
V
V
2.4
5
V
DD
= 4.75V, I
OUT
= – 10µA
V
DD
= 4.75V, I
OUT
= – 400µA
V
DD
= 4.75V, I
OUT
= 160µA
V
DD
= 4.75V, I
OUT
= 1.6mA
V
OUT
= 0V to V
DD
, CS High
CS High (Note 11)
V
OUT
= 0V
V
OUT
= V
DD
4.5
q
q
q
q
4.0
0.05
0.10
0.4
±10
15
–10
10
V
V
µA
pF
mA
mA
1603f
3
LTC1603
POWER REQUIRE E TS
SYMBOL
V
DD
V
SS
I
DD
PARAMETER
Positive Supply Voltage
Negative Supply Voltage
Positive Supply Current
Nap Mode
Sleep Mode
Negative Supply Current
Nap Mode
Sleep Mode
Power Dissipation
Nap Mode
Sleep Mode
The
q
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
(Notes 12, 13)
(Note 12)
CS = RD = 0V
CS = 0V, SHDN = 0V
CS = 5V, SHDN = 0V
CS = RD = 0V
CS = 0V, SHDN = 0V
CS = 5V, SHDN = 0V
CS = RD = 0V
CS = 0V, SHDN = 0V
CS = 5V, SHDN = 0V
q
I
SS
P
D
The
q
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL
f
SMPL(MAX)
t
CONV
t
ACQ
t
ACQ+CONV
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
Throughput Time (Acquisition + Conversion)
CS to RD Setup Time
CS↓ to CONVST↓ Setup Time
SHDN↓ to CS↑ Setup Time
SHDN↑ to CONVST↓ Wake-Up Time
CONVST Low Time
CONVST to BUSY Delay
Data Ready Before BUSY↑
q
TI I G CHARACTERISTICS
Delay Between Conversions
Wait Time RD↓ After BUSY↑
Data Access Time After RD↓
t
11
Bus Relinquish Time
LTC1603C
LTC1603I
q
q
q
q
t
12
t
13
t
14
RD Low Time
CONVST High Time
Aperture Delay of Sample-and-Hold
4
U W
MIN
4.75
– 4.75
TYP
MAX
5.25
– 5.25
UNITS
V
V
mA
mA
µA
mA
µA
µA
mW
mW
mW
18
1.5
1
26
1
1
220
7.5
0.01
30
2.4
100
40
100
100
350
12
1
q
q
UW
CONDITIONS
q
q
MIN
250
2.2
TYP
3.3
MAX
3.8
480
4
UNITS
kHz
µs
ns
µs
ns
ns
ns
(Note 11)
(Notes 11, 12)
(Notes 11, 12)
(Notes 11, 12)
CS = Low (Note 12)
(Note 12)
C
L
= 25pF
q
q
q
q
q
0
10
10
400
40
36
80
60
32
200
–5
40
50
60
60
75
60
70
75
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
q
q
(Note 12)
(Note 12)
C
L
= 25pF
q
q
q
C
L
= 100pF
q
45
50
(Note 12)
(Note 12)
t
10
40
2
ns
1603f
LTC1603
TI I G CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
All voltage values are with respect to ground with DGND, OGND
and AGND wired together unless otherwise noted.
Note 3:
When these pin voltages are taken below V
SS
or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
greater than 100mA below V
SS
or above V
DD
without latchup.
Note 4:
When these pin voltages are taken below V
SS
, they will be clamped
by internal diodes. This product can handle input currents greater than
100mA below V
SS
without latchup. These pins are not clamped to V
DD
.
Note 5:
V
DD
= 5V, V
SS
= – 5V, f
SMPL
= 250kHz, and t
r
= t
f
= 5ns unless
otherwise specified.
Note 6:
Linearity, offset and full-scale specification apply for a single-
ended A
IN+
input with A
IN–
grounded.
Note 7:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
TYPICAL PERFORMANCE CHARACTERISTICS
Integral Nonlinearity vs
Output Code
2.0
1.5
1.0
INL (LSB)
0.5
0.0
–0.5
–1.0
–1.5
–2.0
–32768
DNL (LSB)
–16384
U W
UW
(Note 5)
Note 8:
Typical RMS noise at the code transitions. See Figure 17 for
histogram.
Note 9:
Bipolar offset is the offset voltage measured from – 0.5LSB when
the output code flickers between 0000 0000 0000 0000 and 1111 1111
1111 1111.
Note 10:
Signal-to-Noise Ratio (SNR) is measured at 5kHz and distortion
is measured at 100kHz. These results are used to calculate Signal-to-Nosie
Plus Distortion (SINAD).
Note 11:
Guaranteed by design, not subject to test.
Note 12:
Recommended operating conditions.
Note 13:
The falling CONVST edge starts a conversion. If CONVST returns
high at a critical point during the conversion it can create small errors. For
best performance ensure that CONVST returns high either within 250ns
after conversion start or after BUSY rises.
Differential Nonlinearity vs
Output Code
1.0
0.8
0.6
0.4
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
0
CODE
16384
32767
1603 G11
–32768
–16384
0
CODE
16384
32767
1603 G10
1603f
5
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