ADS804| Datasheet

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ADS804
ADS 804 E

SBAS068B JANUARY 1997 REVISED AUGUST 2002

12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER
FEATURES
q q q q q q HIGH SFDR: 80dB at NYQUIST HIGH SNR: 69dB LOW POWER: 180mW LOW DLE: 0.3LSB FLEXIBLE INPUT RANGE OVERRANGE INDICATOR

APPLICATIONS
q q q q IF AND BASEBAND DIGITIZATION CCD IMAGING SCANNERS TEST INSTRUMENTATION

DESCRIPTION
The ADS804 is a high-speed, high dynamic range, 12-bit, pipelined Analog-to-Digital (A/D) converter. This converter includes a high-bandwidth track-and-hold that gives excellent spurious performance up to and beyond the Nyquist rate. This high-bandwidth, linear track-and-hold minimizes harmonics and has low jitter, leading to excellent SNR performance. The ADS804 is also pin-compatible with the 5MHz ADS803 and the 20MHz ADS805. The ADS804 provides an internal reference and can be programmed for a 2Vp-p input range for the best spurious performance and ease of driving. Alternatively, the 5Vp-p input range can be used for the lowest input referred noise
+VS

of 0.09LSBs rms giving superior imaging performance. There is also a capability to set the input range in between the 2Vpp and 5Vp-p input ranges or to use external reference. The ADS804 also provides an over-range indicator flag to indicate an input range that exceeds the full-scale input range of the converter. This flag can be used to reduce the gain of the front end gain-ranging circuitry. The ADS804 employs digital error correction techniques to provide excellent differential linearity for demanding imaging applications. Its low distortion and high SNR give the extra margin needed for communications, medical imaging, video, and test instrumentation applications. The ADS804 is available in a SSOP-28 package.

CLK

VDRV

ADS804 Timing Circuitry

VIN

IN T&H IN (Opt.) CM

12-Bit Pipelined A/D Converter Core

Error Correction Logic

3-State Outputs

D0 D11

Reference Ladder and Driver Reference and Mode Select

OVR

REFT

VREF

SEL

REFB

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 Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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