LTC1609
16-Bit, 200ksps, Serial ADC
with Multiple Input Ranges
FEATURES
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DESCRIPTIO
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Sample Rate: 200ksps
Input Ranges
Unipolar: 0V to 10V, 0V to 5V and 0V to 4V
Bipolar:
鹵10V, 鹵5V
and
鹵3.3V
Guaranteed No Missing Codes
Serial I/O
Single 5V Supply
Power Dissipation: 65mW Typ
Power Down Mode: 50碌W
SNR: 87dB Typ
Operates with Internal or External Reference
28-Pin SSOP and 20-Pin SO Packages
Improved 2nd Source to ADS7809 and AD977A
The LTC
廬
1609 is a 200ksps, serial sampling 16-bit A/D
converter that draws only 65mW (typical) from a single 5V
supply. This easy-to-use device includes a sample-and-
hold, a precision reference, a switched capacitor succes-
sive approximation A/D and trimmed internal clock.
The input range is specified for bipolar inputs of
鹵10V,
鹵5V
and
鹵3.3V
and unipolar inputs of 0V to 10V, 0V to 5V
and 0V to 4V. Maximum DC specs include
鹵2LSB
INL and
16-bit no missing codes over temperature. It has a typical
signal-to-noise ratio of 87dB.
The ADC has a high speed serial interface. The serial
output data can be clocked out using either the internal
serial shift clock or be clocked out by an external shift
clock. A separate convert start input (R/C) and a data ready
signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
TYPICAL APPLICATIO
ANALOG INPUT
鈥?10V TO 10V
200鈩?/div>
1
2
100鈩?/div>
33.2k
3
4
5
2.5V
200kHz, 16-Bit Serial Sampling ADC Configured for
鹵10V
Inputs
R1
IN
AGND1
R2
IN
R3
IN
NC
CAP
REF
NC
AGND2
NC
NC
SB/BTC
V
DIG
V
ANA
PWRD
BUSY
LTC1609
CS
NC
NC
R/C
NC
TAG
NC
DATA
28
27
26
25
24
鈥?0
+
10碌F
0.1碌F
5V
2.2碌F
2.5V
+
2.2碌F
7
8
9
10
11
12
13
14
22
21
20
19
18
17
16
15
1609 TA01
MAGNITUDE (dB)
+
6
23
SERIAL INTERFACE
EXT/INT DATACLK
DGND
SYNC
U
Nonaveraged 4096 Point FFT Plot
0
f
SAMPLE
= 200kHz
f
IN
= 1kHz
SINAD = 87.2dB
THD = 鈥?00.1dB
鈥?0
鈥?0
鈥?0
鈥?00
鈥?20
鈥?30
0
25
50
FREQUENCY (kHz)
1609 G06
U
U
75
100
1609fa
1
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