Features: 14-Bit 15 MSPS A/D Converter
No Missing Codes Guaranteed
3-Channel Operation Up to 15 MSPS
1-Channel Operation Up to 12.5 MSPS
Correlated Double Sampling
16x Programmable Gain
6350 mV Programmable Offset
Input Clamp Circuitry
Internal Voltage Reference
Multiplexed Byte-Wide Output (8+6 Format)
3-Wire Serial Digital Interface
3 V/5 V Digital I/O Compatibility
28-Lead SOIC or SSOP
Low Power CMOS: 385 mW (Typ)
Power-Down Mode: <1 mWApplicationFlatbed Document Scanners
Film Scanners
Digital Color Copiers
Multifunction PeripheralsPinout
Specifications
| Parametert |
With RespectTo |
Min |
Max |
Uni |
VIN, CAPT, CAPB
Digital Inputs
AVDD
DRVDD
AVSS
Digital Outputs
Junction Temperature
Storage Temperature
Lead Temperature
(10 sec) |
AVSS
AVSS
AVSS
DRVSS
DRVSS
DRVSS |
0.3
0.3
0.5
0.5
0.3
0.3
65 |
AVDD + 0.3
AVDD + 0.3
+6.5
+6.5
+0.3
DRVDD + 0.3
150
+150
300 |
V
V
V
V
V
V
C
C
C |
| DNL typ (LSB) |
±0.65LSB |
| INL (LSB) |
-5LSB |
| Input Noise (LSB rms) |
1.5LSB |
| Input Range (V p-p) |
2V p-p |
| Vos Correction Range (mV) |
±300mV |
| PGA Range (dB) |
6 V/V |
| Power Dissipation (mW) |
380mW |
| Resolution (Bits) |
14bit |
| Sample Rate (MSPS) |
15MSPS |
DescriptionThe AD9822 is a complete analog signal processor for CCD imaging applications. It features a 3-channel architecture designed to sample and condition the outputs of trilinear color CCD arrays. Each channel consists of an input clamp, Correlated Double Sampler (CDS), offset DAC and Pro-grammable Gain Amplifier (PGA), multiplexed to a high performance 14-bit A/D converter.
The CDS amplifiers may be disabled for use with sensors such as Contact Image Sensors (CIS) and CMOS active pixel sensors, which do not require CDS.
The 14-bit digital output is multiplexed into an 8-bit output word that is accessed using two read cycles. The internal registers are programmed through a 3-wire serial interface, and provide adjustment of the gain, offset, and operating mode.
The AD9822 operates from a single 5 V power supply, typically consumes 385 mW of power, and is packaged in a 28-lead SOIC or SSOP.
AD9822 Data Sheet
