ADS7806
ADS
780
6
ADS
780
6
SBAS021B – NOVEMBER 1992 – REVISED SEPTEMBER 2003
Low-Power 12-Bit Sampling CMOS
ANALOG-to-DIGITAL CONVERTER
FEATURES
q
POWER DISSIPATION: 35mW max
q
POWER-DOWN MODE: 50
µ
W
q
ACQUISITION AND CONVERSION: 25
µ
s max
q
±
1/2 LSB MAX INL AND DNL
q
72dB MIN SINAD WITH 1kHz INPUT
q
INPUT RANGES:
±
10V, 0V to +5V, and 0V TO +4V
q
SINGLE +5V SUPPLY OPERATION
q
q
q
q
PARALLEL AND SERIAL DATA OUTPUT
PIN-COMPATIBLE WITH THE 16-BIT ADS7807
USES INTERNAL OR EXTERNAL REFERENCE
0.3" DIP-28 AND SO-28
DESCRIPTION
The ADS7806 is a low-power, 12-bit, sampling Analog-to-
Digital (A/D) converter using state of the art CMOS structures.
It contains a complete 12-bit, capacitor-based, Successive
Approximation Register (SAR) A/D converter with sample-
and-hold, clock, reference, and a microprocessor interface with
parallel and serial output drivers.
The ADS7806 can acquire and convert to full 12-bit accuracy
in 25µs max, while consuming only 35mW max. Laser
trimmed scaling resistors provide standard industrial input
ranges of
±10V
and 0V to +5V. In addition, a 0V to +4V range
allows development of complete single-supply systems.
The ADS7806 is available in a 0.3" DIP-28 and SO-28, both
fully specified for operation over the industrial –40°C to
+85°C temperature range.
Clock
Successive Approximation Register and Control Logic
R/C
CS
BYTE
Power
Down
40kΩ
R1
IN
CDAC
BUSY
Parallel
20kΩ
40kΩ
Comparator
and
Serial
Data
Serial Data
Serial Data
Clock
10kΩ
R2
IN
CAP
Buffer
6kΩ
REF
Internal
+2.5V Ref
Out
Parallel Data
8
Reference
Power-Down
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
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