Features: Mixed-Signal Front-End Processor with Dual Converter
Receive and Dual Converter Transmit Signal Paths
Receive Signal Path Includes:
Two 10-/12-Bit, 64 MSPS Sampling A/D Converters
with Internal or External Independent References,
Input Buffers, Programmable Gain Amplifiers,
Low-Pass Decimation Filters, and a Digital Hilbert Filter
Transmit Signal Path Includes:
Two 12-/14-Bit, 128 MSPS D/A Converters with
Programmable Full-Scale Output Current, Channel
Independent Fine Gain and Offset Control, Digital
Hilbert and Interpolation Filters, and Digitally Tunable
Real or Complex Up-Converters
Delay-Locked Loop Clock Multiplier and Integrated
Timing Generation Circuitry Allow for Single Crystal
or Clock Operation
Programmable Output Clocks, Serial Programmable
Interface, Programmable Sigma-Delta, Three Auxiliary
DAC Outputs and Two Auxiliary ADCs with Dual
Multiplexed InputsApplicationBroadband Wireless Systems
Fixed Wireless, WLAN, MMDS, LMDS
Broadband Wireline Systems
Cable Modems, VDSL, PowerPlug
Digital Communications
Set-Top Boxes, Data ModemsPinout
Specifications
| Resolution (Bits) |
10bit |
| T-Put Rate |
64MSPS |
| # Chan |
2 |
| Supply V |
Single(+3.3) |
| Sample Rate |
64MSPS |
| ADC Bits x #ADCs-Speed |
10x2-64 MHz |
| DAC Bits x #DACs-ClkSpeed |
12x2-128 MHz |
| Pkg Type |
QFP |
| Primary Application |
Broadband Wireless |
Power Supply (VAS, VDS) . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Digital Inputs . . . . . . . . . . . . . . . . . 0.3 V to DRVDD + 0.3 V
Analog Inputs . . . . . . . . . . . . . ..0.3 V to AVDD (IQ) + 0.3 V
Operating Temperature2. . . . . . . . . . . . . . . . 40 to +70
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . 150
Storage Temperature . . . . . . . . . . . . . . . . . .65 to +150
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . 300DescriptionThe AD9860 and AD9862 (AD9860/AD9862) are versatile integrated mixed-signal front-ends (MxFE) that are optimized for broadband communication markets. The AD9860/AD9862 are cost effective, mixed signal solutions for wireless or wireline standards based or proprietary broadband modem systems where dynamic performance, power dissipation, cost, and size are all
critical attributes. The AD9860 has 10-bit ADCs and 12-bitDACs;the AD9862 has 12-bit ADCs and 14-bit DACs.
The AD9860/AD9862 receive path (Rx) consists of two channels that each include a high performance, 10-/12-bit, 64 MSPS analog- to-digital converter (ADC), input buffer, Programmable Gain Amplifier (RxPGA), digital Hilbert filter, and decimation filter. The Rx can be used to receive real, diversity, or I/Q data at baseband or low IF. The input buffers provide a constant input impedance for both channels to ease impedance matching with external com-ponents (e.g., SAW filter). The RxPGA provides a 20 dB gain *Protected by U.S.Patent No. 5,969,657; other patents pending.MxFE is a trademark of Analog Devices, Inc.range for both channels. The output data bus can be multi-plexed to accommodate a variety of interface types.
The AD9860/AD9862 transmit path (Tx) consists of two chan-nels that contain high performance, 12-/14-bit, 128 MSPS digital-to-analog converters (DAC), programmable gain amplifiers
(TxPGA), interpolation filters, a Hilbert filter, and digital mixers for complex or real signal frequency modulation. The Tx latch and demultiplexer circuitry can process real or I/Q data. Interpo-
lation rates of 2 and 4 are available to ease requirements on an external reconstruction filter. For single channel systems, the digital Hilbert filter can be used with an external quadrature
modulator to create an image rejection architecture. The two 12-/14-bit, high performance DACs produce an output signal that can be scaled over a 20 dB range by the TxPGA.
A programmable delay-locked loop (DLL) clock multiplier and integrated timing circuits enable the use of a single external reference clock or an external crystal to generate clocking for all
internal blocks and also provides two external clock outputs. Additional features include a programmable sigma-delta output, four auxiliary ADC inputs and three auxiliary DAC outputs.
Device programmability is facilitated by a serial port interface (SPI) combined with a register bank. The AD9860/AD9862 is available in a space saving 128-lead LQFP.
AD9860 Data Sheet
