AD9640ABCPZ-80 datasheet(4/52 Pages) AD

Part #	AD9640ABCPZ-80

Description	14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter

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Manufacturer	AD [Analog Devices]

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AD9640

Rev. B | Page 4 of 52

GENERAL DESCRIPTION

The AD9640 is a dual 14-bit, 80/105/125/150 MSPS analog-to-

digital converter (ADC). The AD9640 is designed to support

communications applications where low cost, small size, and

versatility are desired.

The dual ADC core features a multistage, differential pipelined

architecture with integrated output error correction logic. Each

ADC features wide bandwidth differential sample-and-hold

analog input amplifiers supporting a variety of user-selectable

input ranges. An integrated voltage reference eases design

considerations. A duty cycle stabilizer is provided to compen-

sate for variations in the ADC clock duty cycle, allowing the

converters to maintain excellent performance.

The AD9640 has several functions that simplify the automatic

gain control (AGC) function in the system receiver. The fast detect

feature allows fast overrange detection by outputting four bits of

input level information with very short latency.

In addition, the programmable threshold detector allows moni-

toring of the incoming signal power using the four fast detect

bits of the ADC with very low latency. If the input signal level

exceeds the programmable threshold, the fine upper threshold

indicator goes high. Because this threshold is set from the four

MSBs, the user can quickly turn down the system gain to avoid an

overrange condition.

The second AGC-related function is the signal monitor. This

block allows the user to monitor the composite magnitude of

the incoming signal, which aids in setting the gain to optimize

the dynamic range of the overall system.

The ADC output data can be routed directly to the two external

14-bit output ports. These outputs can be set from 1.8 V to 3.3 V

CMOS or 1.8 V LVDS.

Flexible power-down options allow significant power savings,

when desired.

Programming for setup and control is accomplished using a

3-bit SPI-compatible serial interface.

The AD9640 is available in a 64-lead LFCSP and is specified

over the industrial temperature range of −40°C to +85°C.

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Analog Devices	AD9640ABCPZ-80	1Mb / 52P	14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. B
Analog Devices	AD9640ABCPZ-80	1Mb / 54P	1.8V Dual Analog-to-Digital Converter

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Analog Devices	AD9640	1Mb / 52P	14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. B
	AD9640	931Kb / 41P	14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter Rev. PrD
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	AD9258BCPZ-80	2Mb / 44P	14-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC) REV. A
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AD9640ABCPZ-80 Datasheet(PDF) 4 Page - Analog Devices

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