Datasheet


SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
www.ti.com
14
+3V
+3V
0.1
µ
F
0.1µF
0.1
µ
F
2nd−Order
∆Σ
Modulator
FPGA
or
ASIC
CH A+
AV
DD
CH A−
Output
Interface
Circuit
RC
Oscillator
20MHz
Out EN
Clock
Select
Divider
REFIN A
Reference
Voltage
2.5V
REFOUT
OUT A
OUT B
CLKIN
AGNDAGNDAGNDAGND
BV
DD
CLKOUT
BV
DD
BGND
+5V
0.1
µ
F
+5V
0.1µF
+5V
0.1
µ
F
+5V
0.1µF
CLKSEL
AV
DD
AV
DD
AV
DD
AV
DD
2nd−Order
∆Σ
Modulator
CH B+
CH B
−
REFIN B
27
Ω
R1
R2
+5V
0.1nF
IN+
IN
−
OPA4354
27
Ω
R1
R2
+5V
OPA4354
27
Ω
R1
R2
+5V
0.1nF
IN+
IN
−
OPA4354
27
Ω
R1
R2
+5V
OPA4354
+5V
OPA336
Figure 29. Differential Connection Diagram for the ADS1205 Delta-Sigma Modulator