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参数资料
| 型号： | AD7732BRUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT 2CH SIG-DEL 28TSSOP |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 15.4k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 100mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个差分，单极；2 个差分，双极 |
| 配用： | EVAL-AD7732EBZ-ND - BOARD EVAL FOR AD7732 |
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AD7732
Rev. A | Page 26 of 32
CIRCUIT DESCRIPTION
The AD7732 is a sigma-delta ADC that is intended for the
measurement of wide dynamic range, low frequency signals in
industrial process control, instrumentation, and PLC systems.
It contains thin film resistor dividers, a multiplexer, an input
buffer, a sigma-delta (or charge balancing) ADC, a digital filter,
a clock oscillator, a digital I/O port, and a serial
communications interface.
Analog Front End
The AD7732 features two fully differential analog inputs. The
on-chip thin film resistor dividers allow ±10 V, ±5 V, 0 V to +10
V, and 0 V to +5 V input signals to be connected directly to the
analog input pins.
The resistor divider input stage is followed by the multiplexer
and then by a wide bandwidth, fast settling time differential
input buffer capable of driving the dynamic load of a high speed
sigma-delta modulator.
In normal circuit configuration, the BIAS pins are connected to
the 2.5 V (reference) voltage source. This ensures that the
differential signal seen by the internal input buffer is within its
absolute/common-mode range of AGND + 200 mV to
AVDD – 300 mV.
The AD7732 AIN differential voltage should be within the
specified nominal (up to ±10 V) input range, otherwise the
performance on channel might degrade (see the Analog Input’s
Extended Voltage Range section).
The AD7732 INL performance varies with the AIN common-
mode voltage (Figure 9). The differential analog input voltage of
±10 V with a common-mode voltage of 0 V means that the AIN
differential voltage is centered around AGND and both AIN(+)
and AIN(–) change within ±5 V respect to AGND. The AD7732
INL also varies with the MCLK frequency (Figure 7).
If the BIAS pins are in normal configuration, the AIN pin
absolute voltage up to ±16.5 V does not degrade the adjacent
channel’s performance. An AIN absolute voltage over ±16.5 V
results in current flowing through the internal protection
diodes located behind the thin film resistors; the adjacent
channel can be affected. By configuring the BIAS and RA to RD
pins differently, the part will work with higher AIN absolute
voltages as long as the internal voltage seen by the multiplexer
and input buffer is within 200 mV to AVDD – 300 mV. Absolute
voltage for the AIN, BIAS, and RA to RD pins must never
exceed the values specified in the Absolute Maximum Ratings.
Note that the OVR bit in the channel status register is generated
digitally from the conversion result and indicates the sigma-
delta modulator (nominal) overrange. The OVR bit DOES NOT
indicate exceeding the AIN pin absolute/common-mode
voltage limits.
Figure 23 shows the AD7732 analog input internal structure.
BIAS
AIN
1R
7R
108.5k
Ω
15.5k
Ω
AVDD
MUX
PROTECTION
DIODES
AGND
2.1875V ± 1.25V
2.5V
±10V
BUFFER
Figure 23. Simplified Analog Input Internal Structure
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| AD7732BRUZ-REEL7 | 功能描述:IC ADC 24BIT 2CH SIG-DEL 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7734 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, +-10 V Input Range, High Throughput, 24-Bit sigma ∆ ADC |
| AD7734BRU | 功能描述:IC ADC 24BIT 4-CH 28-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7734BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 3.05Msps 24-bit Serial 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.437KSPS 24BIT SERL 28TSSOP - Tape and Reel |
| AD7734BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 3.05Msps 24-bit Serial 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.437KSPS 24BIT SERL 28TSSOP - Tape and Reel |
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