AD9704:  8-Bit, 175 MSPS TxDAC® Digital-to-Analog Converters

The AD9704/AD9705/AD9706/AD9707 are the fourth-generation family in the TxDAC series of high performance, CMOS digital-to-analog converters (DACs). This pin-compatible, 8-/10-/12-/14-bit resolution ...More

AD9704:  8-Bit, 175 MSPS TxDAC® Digital-to-Analog Converters

Product Description

The AD9704/AD9705/AD9706/AD9707 are the fourth-generation family in the TxDAC series of high performance, CMOS digital-to-analog converters (DACs). This pin-compatible, 8-/10-/12-/14-bit resolution family is optimized for low power operation, while maintaining excellent dynamic performance. The AD9704/ AD9705/AD9706/AD9707 family is pin-compatible with the AD9748/AD9740/AD9742/AD9744 family of TxDAC convert-ers and is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface, LFCSP_VQ package, and pinout, providing an upward or downward component selection path based on performance, resolution, and cost. The AD9704/AD9705/ AD9706/AD9707 offers exceptional ac and dc performance, while supporting update rates up to 175 MSPS.

The flexible power supply operating range of 1.7 V to 3.6 V and low power dissipation of the AD9704/AD9705/AD9706/AD9707 parts make them well-suited for portable and low power applications.

Power dissipation of the AD9704/AD9705/AD9706/AD9707 can be reduced to 15 mW, with a small trade-off in performance, by lowering the full-scale current output. In addition, a power-down mode reduces the standby power dissipation to approxi-mately 2.2 mW.

The AD9704/AD9705/AD9706/AD9707 has an optional serial peripheral interface (SPI®) that provides a higher level of program-mability to enhance performance of the DAC. An adjustable output, common-mode feature allows for easy interfacing to other components that require common modes from 0 V to 1.2 V.

Edge-triggered input latches and a 1.0 V temperature-compensated band gap reference have been integrated to provide a complete, monolithic DAC solution. The digital inputs support 1.8 V and 3.3 V CMOS logic families.

Product Highlights

  1. Pin Compatible. The AD9704/AD9705/AD9706/AD9707 line of TxDAC converters is pin-compatible with the AD9748/AD9740/AD9742/AD9744 TxDAC line (LFCSP_VQ package).
  2. Low Power. Complete CMOS DAC operates on a single supply of 3.6 V down to 1.7 V, consuming 50 mW (3.3 V) and 12 mW (1.8 V). The DAC full-scale current can be reduced for lower power operation. Sleep and power-down modes are provided for low power idle periods.
  3. Self-Calibration. Self-calibration enables true 14-bit INL and DNL performance in the AD9707.
  4. Twos Complement/Binary Data Coding Support. Data input supports twos complement or straight binary data coding.
  5. Flexible Clock Input. A selectable high speed, single-ended, and differential CMOS clock input supports 175 MSPS conversion rate.
  6. Device Configuration. Device can be configured through pin strapping, and SPI control offers a higher level of programmability.
  7. Easy Interfacing to Other Components. Adjustable common-mode output allows for easy interfacing to other signal chain components that accept common-mode levels from 0 V to 1.2 V.
  8. On-Chip Voltage Reference. The AD9704/AD9705/AD9706/ AD9707 include a 1.0 V temperature-compensated band gap voltage reference.
  9. Industry-Standard 32-Lead LFCSP_VQ Package.

Data Sheet, Rev. A, 4/07

Features

  • 175 MSPS update rate
  • Low power member of pin-compatible TxDAC product family
  • Low power dissipation
    12 mW @ 80 MSPS, 1.8 V
    50 mW @ 175 MSPS, 3.3 V
  • Wide supply voltage: 1.7 V to 3.6 V
  • SFDR to Nyquist
    AD9707: 84 dBc @ 5 MHz output
    AD9707: 83 dBc @ 10 MHz output
    AD9707: 75 dBc @ 20 MHz output
  • AD9707 NSD @ 10 MHz output, 125 MSPS: −147 dBc/Hz
  • Adjustable full-scale current outputs: 1 mA to 5 mA
  • On-chip 1.0 V reference
  • CMOS-compatible digital interface
  • Common-mode output: adjustable 0 V to 1.2 V
  • Power-down mode < 2 mW @ 3.3 V (SPI controllable) Self-calibration
  • Compact 32-lead LFCSP_VQ, RoHS compliant package

Diagrams

AD9704 Diagram
Functional Block Diagram for AD9704

Specifications

Resolution (Bits) 8bit
DAC Update Rate 175MSPS
DAC Settling Time 11ns
# DAC Outputs 1
DAC Type Current Out
DAC Input Format Par
Output FSR (0-2mA)
Ref Int/Ext Int/Ext
Supply Vnom Single(+2.7),Single(+3),Single(+3.3)
Pwr Diss (Max) 57mW
Package CSP,SOP

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Part# Res (bits) Update Rate Settling Time # Outputs
AD9748 8 210MSPS 11ns 1
AD9704 8 175MSPS 11ns 1
AD9751 10 300MSPS 11ns 1
AD9705 10 175MSPS 11ns 1
AD9740 10 210MSPS 11ns 1
AD9742 12 210MSPS 11ns 1
AD9706 12 175MSPS 11ns 1