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 a 12-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 eight-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.
| Resolution (Bits) | 12 |
| Sample rate (Msps) | 21 |
| Gain (min) (dB) | 0 |
| Gain (max) (dB) | 36 |
| Pd (typ) (mW) | 90 |
| Supply voltage (max) (V) | 3.3 |
| Operating temperature range (°C) | 0 to 70 |
| Output data format | CMOS Parallel |
| Rating | Catalog |
| TQFP (PFB) | 48 | 81 mm² 9 x 9 |
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