VSP1221
www.ti.com
SLES012A–SEPTEMBER 2001–REVISED JULY 2004
12-BIT, 21-MSPS, ULTRALOW-POWER
CCD SIGNAL PROCESSOR
FEATURES
PIN ASSIGNMENTS
•
•
•
12-Bit, 21-MSPS, Analog-to-Digital
Converter
PACKAGE
(TOP VIEW)
Low Power: 70 mW Minimum
Power-Down Mode: 4 mW
Low Input-Referred Noise: 75-dB
SNR Typical at 0-dB Gain
48 47 46 45 44 43 42 41 40 39 38 37
•
•
•
•
Novel Optical-Black (OB) Calibration
Low-Aperture Delay
36
35
34
33
32
31
30
29
28
27
26
25
DACO2
AVSS
DACO1
AVDD
TP2
D0/SDO
D1
1
2
3
4
5
6
7
8
9
Single 3-V Supply Operation
D2
D3
D4
D5
DNL: <±0.5 LSB and
INL: <±1.5 LSB Typical at 0-dB Gain
PIN
DIN
•
•
Programmable-Gain Range: 0 dB to 36 dB,
Gain Resolution of 0.05 dB/Step
D6
TP1
D7
D8
48-Pin TQFP Package
CLREF
AVDD
AVSS
VSS
D9 10
APPLICATIONS
D10
D11
11
12
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Digital Still Camera
•
Digital Video Camera
13 14 15 16 17 18 19 20 21 22 23 24
DESCRIPTION
The VSP1221 is a highly-integrated mixed-signal IC
used for signal conditioning and analog-to-digital
conversion at the output of a CCD array. The IC has
a correlated double sampler (CDS) and an analog
programmable-gain amplifier (PGA) stage followed by
an analog-to-digital converter (ADC) and a digital
PGA stage. The CDS is used to sample the CCD
signal and is followed by the analog PGA stage. The
ADC is a12-bit, 21-MSPS pipelined ADC. The digital
PGA provides further amplification.
Additionally, there is an offset calibration loop for
optical-black correction. The optical-black reference
level is user-programmable. The chip also has two
8-bit digital-to-analog converters (DAC) for external
analog settings.
The chip has a serial port for configuring internal
control registers.
The VSP1221 is available in a 48-pin TQFP package
and operates from a single 3-V power supply.
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.
Copyright © 2001–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.