ADS7808
ADS
7808
SBAS018A – JANUARY 1992 – REVISED SEPTEMBER 2003
12-Bit 10
µ
s Serial CMOS Sampling
ANALOG-to-DIGITAL CONVERTER
FEATURES
q
100kHz SAMPLING RATE
q
72dB SINAD WITH 45kHz INPUT
q
±
1/2 LSB INL AND DNL
q
SIX SPECIFIED INPUT RANGES
q
SERIAL OUTPUT
q
SINGLE +5V SUPPLY OPERATION
q
PIN-COMPATIBLE WITH 16-BIT ADS7809
q
USES INTERNAL OR EXTERNAL
REFERENCE
q
100mW MAX POWER DISSIPATION
q
0.3" SO-20
q
SIMPLE DSP INTERFACE
DESCRIPTION
The ADS7808 is a complete 12-bit sampling analog-to-digital
using state-of-the-art CMOS structures. It contains a 12-bit
capacitor-based SAR A/D with S/H, reference, clock, and a
serial data interface. Data can be output using the internal
clock, or can be synchronized to an external data clock. The
ADS7808 also provides an output synchronization pulse for
ease of use with standard DSP processors.
The ADS7808 is specified at a 100kHz sampling rate, and
specified over the full temperature range. Laser-trimmed
scaling resistors provide various input ranges including
±10V
and 0V to 5V, while an innovative design operates from a
single +5V supply, with power dissipation under 100mW.
The ADS7808 is available in a 0.3" SO-20, fully specified for
operation over the industrial –40°C to +85°C range.
R/C
CS
Power Down
Successive Approximation Register and Control Logic
Clock
20kΩ
R1
IN
10kΩ
R2
IN
20kΩ
5kΩ
R3
IN
CAP
Buffer
4kΩ
REF
Internal
+2.5V Ref
Comparator
Serial
Data
Out
Serial Data
Data Clock
BUSY
CDAC
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