參數(shù)資料
型號(hào)： TLC32046I
廠商： Texas Instruments, Inc.
英文描述： Wide-Band Analog Interface Circuit
中文描述： 寬帶模擬接口電路
文件頁(yè)數(shù)： 39/57頁(yè)
文件大?。?/td> 297K
代理商： TLC32046I
4–1
4 Parameter Measurement Information
Rfb = 4R for D6 = 0, and D7 = 1
Rfb = 2R for D6 = 1 and D7 = 0
D6 = 0 and D7 = 0
Rfb = R for D6 = 1 and D7 = 1
To Multiplexer
Rfb
+
–
IN –
or
AUX IN–
IN +
or
AUX IN+
R
R
–
+
Rfb
Figure 4–1. IN+ and IN – Gain Control Circuitry
Table 4–1. Gain Control Table (Analog Input Signal Required for
Full-Scale Bipolar A/D Conversion Twos Complement)
INPUT
CONTROL REGISTER BITS
D6
ANALOG
INPUT§
A/D CONVERSION
RESULT
CONFIGURATIONS
D7
1
0
1
0
VID=
±
VID =
6 V
±
full scale
Differential configuration
Analog input = IN+ – IN–
= AUX IN+ – AUX IN–
1
0
VID =
±
3 V
VID =
±
1.5 V
±
full scale
±
full scale
0
1
Single-ended configuration
Analog input = IN+ – ANLG GND
= AUX IN+ –ANLG GND
= AUX IN+ ANLG GND
1
0
1
0
VI=
±
VI =
3 V
±
half scale
1
0
0
1
VI =
±
3 V
VI =
±
1.5 V
±
full scale
±
full scale
VCC+ = 5 V, VCC– = –5 V, VDD = 5 V
VID = Differential Input Voltage, VI = Input voltage referenced to ground with IN– or AUX IN– connected to GND.
§In this example, Vref is assumed to be 3 V. In order to minimize distortion, it is recommended that the analog input not
exceed 0.1 dB below full scale.
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