ADS2806
Dual, 12-Bit, 32MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
a71 SPURIOUS-FREE DYNAMIC RANGE:
73dB at 10MHz f
IN
a71 HIGH SNR: 67dB (2Vp-p), 69dB (3Vp-p)
a71 INTERNAL OR EXTERNAL REFERENCE
a71 LOW DLE: ±0.4LSB
a71 FLEXIBLE INPUT RANGE: 2Vp-p to 3Vp-p
a71 TQFP-64 POWER PACKAGE
DESCRIPTION
The ADS2806 is a dual, high-speed, high dynamic range,
12-bit pipelined Analog-to-Digital Converter (ADC). This con-
verter includes a high-bandwidth track-and-hold that gives
excellent spurious performance up to and beyond the Nyquist
rate. The differential nature of this track-and-hold and ADC
circuitry minimizes even-order harmonics and gives excel-
lent common-mode noise immunity. The track-and-hold can
also be operated single-ended.
The ADS2806 provides for setting the full-scale range of the
converter without any external reference circuitry. The internal
APPLICATIONS
a71 COMMUNICATIONS IF PROCESSING
a71 COMMUNICATIONS BASESTATIONS
a71 TEST EQUIPMENT
a71 MEDICAL IMAGING
a71 VIDEO DIGITIZING
a71 CCD DIGITIZING
Optional External
Reference
12-Bit
Pipelined
A/D
Error
Correction
Logic
Timing
Circuitry
Internal
Reference
3-State
Outputs
T&H
D12A
•
•
•
D1A
12-Bit
Pipelined
A/D
Error
Correction
Logic
3-State
Outputs
T&H
D12B
•
•
•
D1B
IN
A
+V
S
OE
A
OVR
A
OVR
B
IN
A
INT/EXT
CLK
FS
SEL
(Opt.)
IN
B
V
IN
CM
OE
B
IN
B
(Opt.)
ADS2806
V
IN
reference can be disabled allowing low drive, external refer-
ences to be used for improved tracking in multichannel systems.
The ADS2806 provides an over-range indicator flag to
indicate an input signal that exceeds the full-scale input
range of the converter. This flag can be used to reduce the
gain of front end gain control circuitry. There is also an
output enable pin to allow for multiplexing and testability on
a PC board.
The ADS2806 employs digital error correction techniques to
provide excellent differential linearity for demanding imag-
ing applications. The ADS2806 is available in a TQFP-64
power package.
ADS2806
SBAS178B – DECEMBER 2000 – REVISED MAY 2002
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.