Edge6420
HIGH-PERFORMANCE PRODUCTS – ATE
Circuit Description (continued)
Decode and Individual DAC Update
RESET*
This is a 13-bit latch for DAC
(Note: there are some current output
DACs that require only 6-bit latches)
L
Q
DAC
DAC
DAC output # 0
DAC output # 1
EN
L
R
Q
EN
R
.
.
.
.
.
.
L
Q
DAC
DAC output # 63
EN
R
ADDRESS
DECODER
ADDR
13
7
Delay
UPDATE
CE
D
Q
CENTRAL DAC LATCH
(24 Latches)
LOAD
CK
R
RESET
CK_OUT
SDO
24-BIT SHIFT REGISTER
SDI
RESET*
RESET
Programming Logic
Figure 1. DAC Functionality Block Diagram
2000 Semtech Corp.
11
www .semtech.com