ADS2807
ADS
280
7
SBAS169B – NOVEMBER 2000 – REVISED MAY 2002
Dual, 12-Bit, 50MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
HIGH SNR: 66dB (2Vp-p), 68dB (3Vp-p)
q
LOW POWER: 720mW
q
INTERNAL OR EXTERNAL REFERENCE
q
LOW DLE: 0.6LSB
q
FLEXIBLE INPUT RANGE: 2Vp-p to 3Vp-p
q
TQFP-64 POWER PACKAGE
APPLICATIONS
q
COMMUNICATIONS IF PROCESSING
q
COMMUNICATIONS BASESTATIONS
q
TEST EQUIPMENT
q
MEDICAL IMAGING
q
VIDEO DIGITIZING
q
CCD DIGITIZING
The ADS2807 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 ADS2807 employs digital error correction techniques to
provide excellent differential linearity for demanding imag-
ing applications. The ADS2807 is available in a TQFP-64
power package.
DESCRIPTION
The ADS2807 is a dual, high-speed, high dynamic range,
12-bit pipelined Analog-to-Digital Converter (ADC). This
converter 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 excellent common-mode noise immunity. The track-
and-hold can also be operated single-ended.
The ADS2807 provides for setting the full-scale range of the
converter without any external reference circuitry. The inter-
nal reference can be disabled allowing low-drive, external
references to be used for improved tracking in multichannel
systems.
+V
S
OE
A
OVR
A
CM
A
V
IN
IN
A
ADS2807
12-Bit
Pipelined
ADC
Error
Correction
Logic
D12A
•
•
•
D1A
T&H
IN
A
(Opt.)
3-State
Outputs
INT/EXT
FS
SEL
Internal
Reference
Timing
Circuitry
CLK
V
IN
IN
B
T&H
IN
B
(Opt.)
CM
B
12-Bit
Pipelined
ADC
Error
Correction
Logic
3-State
Outputs
D12B
•
•
•
D1B
Optional External
Reference
OE
B
OVR
B
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.
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
www.ti.com
BURR-BROWN [ BURR-BROWN CORPORATION ]
