VSP1221 Datasheet, PDF (1/26 Pages) Texas Instruments – 12-BIT, 21-MSPS, ULTRALOW-POWER CCD SIGNAL PROCESSOR

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VSP1221
SLES012A – SEPTEMBER 2001 – REVISED JULY 2004
12-BIT, 21-MSPS, ULTRALOW-POWER
CCD SIGNAL PROCESSOR
FEATURES
• 12-Bit, 21-MSPS, Analog-to-Digital
Converter
• Low Power: 70 mW Minimum
Power-Down Mode: 4 mW
• Low Input-Referred Noise: 75-dB
SNR Typical at 0-dB Gain
• Novel Optical-Black (OB) Calibration
• Low-Aperture Delay
• Single 3-V Supply Operation
• DNL: <±0.5 LSB and
INL: <±1.5 LSB Typical at 0-dB Gain
• Programmable-Gain Range: 0 dB to 36 dB,
Gain Resolution of 0.05 dB/Step
• 48-Pin TQFP Package
APPLICATIONS
• Digital Still Camera
• Digital Video Camera
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.
PIN ASSIGNMENTS
PACKAGE
(TOP VIEW)
D0/SDO
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
DACO2
AVSS
DACO1
AVDD
TP2
PIN
DIN
TP1
CLREF
AVDD
AVSS
VSS
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2004, Texas Instruments Incorporated