FEATURES
Low cost 3.3 V CMOS MxFE™ for broadband applications DOCSIS, EURO-DOCSIS, DVB, DAVIC compliant 232 MHz quadratu...
FEATURES
Low cost 3.3 V
CMOS MxFE™ for broadband applications DOCSIS, EURO-DOCSIS, DVB, DAVIC compliant 232 MHz quadrature digital upconverter 12-bit direct IF DAC (TxDAC+®) Up to 65 MHz carrier frequency DDS Programmable sampling clock rates Analog Tx output level adjust Dual 12-bit, 29 MSPS direct IF ADCs with video clamp input 10-bit, 29 MSPS sampling ADC 8-bit ∑-∆ auxiliary DAC Direct interface to AD832x family of PGA cable drivers
APPLICATIONS
Cable set-top boxes Cable and wireless modems
Mixed-Signal Front End for Broadband Applications
AD9878
TxID[5:0] SDIO
IF10[4:0]
IF12[11:0] FLAG[2:1]
FUNCTIONAL BLOCK DIAGRAM
I Tx Q
16
12
SINC–1
DAC
Tx
DDS 4
CONTROL REGISTERS
MUX
10 12
ADC ADC
MUX
12
ADC
Σ -∆ 3
PLL
Σ-∆ OUTPUT
CA PORT MCLK OSCIN
IF10 INPUT
MUX MUX
Σ
– CLAMP LEVEL
IF12B INPUT VIDEO IN
IF12A INPUT
03277-001
Figure 1.
GENERAL DESCRIPTION
The AD9878 is a single-supply, cable modem/set-top box, mixed-signal front end. The device contains a...
