ADS7808
7808
S
D
A
SBAS018A – JANUARY 1992 – REVISED SEPTEMBER 2003
12-Bit 10µs Serial CMOS Sampling
ANALOG-to-DIGITAL CONVERTER
FEATURES
DESCRIPTION
ꢀ 100kHz SAMPLING RATE
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.
ꢀ 72dB SINAD WITH 45kHz INPUT
ꢀ ±1/2 LSB INL AND DNL
ꢀ SIX SPECIFIED INPUT RANGES
ꢀ SERIAL OUTPUT
ꢀ SINGLE +5V SUPPLY OPERATION
ꢀ PIN-COMPATIBLE WITH 16-BIT ADS7809
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.
ꢀ USES INTERNAL OR EXTERNAL
REFERENCE
ꢀ 100mW MAX POWER DISSIPATION
ꢀ 0.3" SO-20
The ADS7808 is available in a 0.3" SO-20, fully specified for
ꢀ SIMPLE DSP INTERFACE
operation over the industrial –40°C to +85°C range.
CS
Power Down
R/C
Successive Approximation Register and Control Logic
Clock
20kΩ
10kΩ
CDAC
R1IN
R2IN
BUSY
Serial
20kΩ
5kΩ
Data
Out
Data Clock
Serial Data
Comparator
R3IN
CAP
Internal
+2.5V Ref
Buffer
4kΩ
REF
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