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AD588
SUBSTITUTING FOR INTERNAL REFERENCES
Many converters include built-in references. Unfortunately,
such references are the major source of drift in these converters.
By using a more stable external reference like the AD588, drift
performance can be improved dramatically.
AD574A 12-BIT ANALOG-TO-DIGITAL CONVERTER
The AD574A is specified for gain drift from 10 ppm/°C to
50 ppm/°C (depending on grade), using its on-chip reference.
The reference contributes typically 75% of this drift. Using an
AD588 as a reference source can improve the total drift by a
factor of 3 to 4.
RESISTANCE TEMPERATURE DETECTOR (RTD)
EXCITATION
The RTD is a circuit element whose resistance is characterized
by a positive temperature coefficient. A measurement of
resistance indicates the measured temperature. Unfortunately,
the resistance of the wires leading to the RTD often adds error
to this measurement. The 4-wire ohms measurement overcomes
this problem. This method uses two wires to bring an excitation
current to the RTD and two additional wires to tap off the resulting
RTD voltage. If these additional two wires go to a high input
impedance measurement circuit, the effect of their resistance is
negligible. They therefore transmit the true RTD voltage.
Using this combination can result in apparent increases in
R
I=0
+
full-scale error due to the difference between the on-board
reference, by which the device is laser-trimmed, and the
external reference, with which the device is actually applied.
The on-board reference is specified to be 10 V ± 100 mV, while
I EXC
R
RTD
R
V OUT α R RTD
–
R
the external reference is specified to be 10 V ± 1 mV. This may
result in up to 101 mV of apparent full-scale error beyond the
±25 mV specified AD574 gain error. External Resistor R2 and
Resistor R3 allow this error to be nulled. Their contribution to
full-scale drift is negligible.
The high output drive capability allows the AD588 to drive up
to six converters in a multiconverter system. All converters have
gain errors that track to better than ±5 ppm/°C.
I=0
Figure 34. 4-Wire Ohms Measurement
2
12 √ 8
STS 28
3
CS
HIGH
27
4 AO
BITS 24
MIDDLE
LOW
R B
7
A1
R1
6
R4
4
AD588
3
A3
1
14
R1
50 ?
R3
500 ?
20 TURN
R2
5 R/C
6 CE
AD574A
10 REF IN
8 REF OUT
12 BIPP OFF
23
BITS 20
19
BITS 16
+5V 1
R3
5
R2
A2
9
10
8
R5
12
R6
11
13
A4
15
2 +V S
16 –V S
V IN
10V
61.9 ?
13 10V IN
14 20V IN
9 ANA COM
+15V 7
–15V 11
DIG 15
COM
Figure 35. AD588/AD574A Connections
Rev. L | Page 16 of 20
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相关代理商/技术参数
AD588BD 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference
AD588BQ 功能描述:IC VREF SERIES PREC ADJ 16-CDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:2,000 系列:- 基准类型:旁路，可调节，精度 输出电压:1.24 V ~ 16 V 容差:±0.5% 温度系数:- 输入电压:1.24 V ~ 16 V 通道数:1 电流 - 阴极:100µA 电流 - 静态:- 电流 - 输出:20mA 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:TO-226-3、TO-92-3（TO-226AA）成形引线 供应商设备封装:TO-92-3 包装:带卷 (TR)
AD588JQ 功能描述:IC VREF SERIES PREC ADJ 16-CDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:1,000 系列:- 基准类型:旁路，可调节，精度 输出电压:2.495 V ~ 36 V 容差:±0.5% 温度系数:标准值 34ppm/°C 输入电压:2.495 V ~ 36 V 通道数:1 电流 - 阴极:1mA 电流 - 静态:- 电流 - 输出:100mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:TO-243AA 供应商设备封装:SOT-89-3 包装:带卷 (TR)
AD588KQ 功能描述:IC VREF SERIES PREC ADJ 16-CDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:2,000 系列:- 基准类型:旁路，可调节，精度 输出电压:1.24 V ~ 16 V 容差:±0.5% 温度系数:- 输入电压:1.24 V ~ 16 V 通道数:1 电流 - 阴极:100µA 电流 - 静态:- 电流 - 输出:20mA 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:TO-226-3、TO-92-3（TO-226AA）成形引线 供应商设备封装:TO-92-3 包装:带卷 (TR)
AD588SD 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference
AD588SD/883B 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference
AD588SE 制造商:Rochester Electronics LLC 功能描述:- Bulk
AD588SE/883B 制造商:Analog Devices 功能描述:V-Ref Programmable ±5V/±10V 20-Pin LCC Tube