参数资料
型号: TLC32047IFN
厂商: Texas Instruments, Inc.
英文描述: Wide-Band Analog Interface Circuit
中文描述: 宽带模拟接口电路
文件页数: 43/61页
文件大小: 303K
代理商: TLC32047IFN
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 MUX
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 ground.
§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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