www.ti.com

ELECTRICAL CHARACTERISTICS (CONTINUED)

VSP1221

SLES012A – SEPTEMBER 2001 – REVISED JULY 2004

DEVICE SPECIFICATIONS

All typical specifications are at T

stated. All maximum specifications are assured across operating temperature and voltage ranges.

PARAMETERS

TEST CONDITIONS

MIN

TYP

MAX

UNIT

FULL CHANNEL

Input signal level for full-scale output

Single ended, gain = 0 dB

1000

mV

Input capacitance

8

pF

Input referred noise

Gain = 0 dB

130

360

µV

Integral nonlinearity

Gain = 0 dB

±1.5

±2

±5

LSB

Differential nonlinearity

Gain = 0 dB

±0.5 ±0.75 +1.5/-1

LSB

Data latency

10

Clocks

Conversion rate

21

MHz

PGA

Gain control code

10

Bits

Maximum gain

Gain code = 1011010000 (720 Decimal)

36

dB

Minimum gain

Gain code = 0000000000

0

dB

Gain resolution

0.05

dB

Integral nonlinearity

±0.02 ±0.05

±0.4

dB

Differential nonlinearity

±0.02 ±0.05

±0.3

dB

ANALOG-TO-DIGITAL CONVERTER (ADC)

Resolution

12

Bits

Conversion rate

21

MHz

No missing codes

Integral nonlinearity

±1

LSB

Differential nonlinearity

±0.5

LSB

3.5

Data latency

Clocks

(fixed)

GENERAL-PURPOSE DIGITAL-TO-ANALOG CONVERTER (DAC)

Resolution

8

Bits

Integral nonlinearity

±0.1

±1

LSB

Differential nonlinearity

±0.1

±1

LSB

Output voltage range

0

AVDD

V

Output settling time

10-pF external load. Settle to 1 mV

4

µs

SERIAL INTERFACE

Clock frequency (SCLK)

40

MHz

OPTICAL-BLACK CALIBRATION

Maximum correctable CCD black level

100

mV

Convergence time

Black level = 100 mV, gain = 12 dB, OB reference level = 0

440

550

Clocks

Gain = 0-20dB

±1

±2

Gain = 20-26 dB

±1

±4

Calibration error

LSB

Gain = 26-32 dB

±2

±4

Gain = 32-36 dB

±4

±8

5