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参数资料
| 型号： | PGA204AU |
| 元件分类： | 测量放大器 |
| 英文描述： | Precision Gain of 5 Instrumentation Amplifier |
| 中文描述： | 5精密增益仪表放大器 |
| 文件页数： | 11/14页 |
| 文件大小： | 261K |
| 代理商： | PGA204AU |
11
PGA204/205
A
1
A
2
A
3
12
11
10
25k
25k
25k
25k
7
PGA204
PGA205
Resistors can be substituted
for REF200. Power supply
rejection will be degraded.
Feedback
Digitally Selected
Feedback Network
6
V
O2
V+
V
O
= G (V
IN
– V
IN
) + V
REF
+
–
OPA177
V+
10k
100
100
V–
V
REF
±10mV
Adjustment Range
Output Offset
Adjustment
5
14
16
4
V
IN
V
IN
–
+
15
A
1
A
0
Digital
Ground
200k
to 1M
Input Offset
Adjustment
Trim Range
≈
±250μV
13
V+
1
V
O1
9
8
V–
Over-Voltage
Protection
Over-Voltage
Protection
100μA
1/2 REF200
100μA
1/2 REF200
1.3mA flows in the digital ground pin. It is good practice to
return digital ground through a separate connection path so
that analog ground is not affected by the digital ground
current.
The digital inputs, A
0
and A
1
, are not latched; a change in
logic inputs immediately selects a new gain. Switching time
of the logic is approximately 1
μ
s. The time to respond to
gain change is effectively the time it takes the amplifier to
settle to a new output voltage in the newly selected gain (see
settling time specifications).
Many applications use an external logic latch to access gain
control data from a high speed data bus (see Figure 7).
Using
an external latch isolates the high speed digital bus from
sensitive analog circuitry. Locate the latch circuitry as far as
practical from analog circuitry.
Some applications select gain of the PGA204/205 with
switches or jumpers. Figure 2 shows pull-up resistors con-
nected to assure a noise-free logic “1” when the switch,
jumper or open-collector logic is open or off. Fixed-gain
applications can connect the logic inputs directly to V+ or
V– (or other valid logic level); no resistor is required.
OFFSET VOLTAGE
Voltage offset of the PGA204/205 consists of two compo-
nents—input stage offset and output stage offset. Both
components are specified in the specification table in equa-
tion form:
V
OS
= V
OSI
+ V
OSO
/ G
(1)
where:
V
OS
total is the combined offset, referred to the input.
V
OSI
is the offset voltage of the input stage, A
1
and A
2
.
V
OSO
is the offset voltage of the output difference
amplifier, A
3
.
V
OSI
and V
OSO
do not change with gain. The composite
offset voltage V
OS
changes with gain because of the gain
term in equation 1. Input stage offset dominates in high gain
(G
≥
100); both sources of offset may contribute at low gain
(G=1 to 10).
OFFSET TRIMMING
Both the input and output stages are laser trimmed for very
low offset voltage and drift. Many applications require no
external offset adjustment.
Figure 3 shows an optional input offset voltage trim circuit.
This circuit should be used to adjust only the input stage
offset voltage of the PGA204/205. Do this by programming
FIGURE 2. Switch or Jumper-Selected Digital Inputs.
A
1
A
2
7
5
14
16
4
V
IN
V
IN
–
+
Over-Voltage
Protection
Over-Voltage
Protection
Digitally Selected
Feedback Network
15
6
9
V
O2
V
OS
Adj
Digital ground can
alternatively be connected
to V– power supply.
V+
100k
100k
Switches, jumpers
or open-collector
logic output.
FIGURE 3. Optional Offset Voltage Trim Circuit.
相关PDF资料 |
PDF描述 |
|---|---|
| PGA204BP | Precision Gain of 5 Instrumentation Amplifier |
| PGA204BU | Precision Gain of 5 Instrumentation Amplifier |
| PGA206 | Micropower single-supply CMOS Instrumentation Amplifier |
| PGA207UA | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:SP02; Number of Contacts:3; Connector Shell Size:8; Connecting Termination:Solder; Circular Shell Style:Box Mount Receptacle |
| PGA206PA | Micropower single-supply CMOS Instrumentation Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PGA204AU | 制造商:Texas Instruments 功能描述:IC SM AMP INSTRUMENT PROG GAIN |
| PGA204AU/1K | 功能描述:仪表放大器 Programmable Gain Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| PGA204AU/1KE4 | 功能描述:仪表放大器 Programmable Gain Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| PGA204AUE4 | 功能描述:仪表放大器 Programmable Gain Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| PGA204AUG4 | 功能描述:仪表放大器 Programmable Gain Instrum Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
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