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参数资料
| 型号： | AD1556ASZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC PGA 24BIT LN 44MQFP |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 256k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 8.5mW |
| 电压电源： | 双电源 |
| 工作温度： | -55°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 2 个差分，双极 |
REV. B
AD1555/AD1556
–10–
AD1555 PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Description
1
AGND1
Analog Ground
2
PGAOUT
Programmable Gain Amplifier Output. The output of the on-chip programmable gain amplifier is
available at this pin. Refer to Table III for PGA gain settings selection.
3, 26
+VA
Positive Analog Supply Voltage. +5 V nominal.
4, 20, 21
–VA
Negative Analog Supply Voltage. –5 V nominal.
5
AIN(+)
Mux Input. Noninverting signal to the PGA mux input. Refer to Table III for input selection.
6
AIN(–)
Mux Input. Inverting signal to the PGA mux input. Refer to Table III for input selection.
7
TIN(+)
Mux Input. Noninverting test signal to the PGA mux input. Refer to Table III for input selection.
8
TIN(–)
Mux Input. Inverting test signal to the PGA mux input. Refer to Table III for input selection.
9NCPin for Factory Use Only. This pin must be kept not connected for normal operation.
10–14
CB0–CB4
Modulator Control. These input pins control the mux selection, the PGA gain settings, and the
standby modes of the AD1555. When used with the AD1556, these pins are generally directly tied
to the CB0–CB4 output pins of the AD1556. CB0–CB2 are generally used to set the PGA gain or
cause it to enter in the PGA standby mode (refer to Table III). CB3 and CB4 select the mux input
voltage applied to the PGA as described in Table III.
15
MFLG
Modulator Error. Digital output that is pulsed high if an overrange condition occurs in the modulator.
16
DGND
Digital Ground
17
MDATA
Modulator Output. The bitstream generated by the modulator is output in a return-to-zero data
format. The data is valid for approximately one-half a MCLK cycle. Refer to Figure 3.
18
MCLK
Clock Input. The clock input signal, nominally 256 kHz, provides the necessary clock for the
Σ-
modulator. When this input is static, AD1555 is in the power-down mode.
19
VL
Positive Digital Supply Voltage. 5 V Nominal.
22
AGND3
Analog Ground. Used as the ground reference for the REFIN pin.
23
REFCAP1
DAC Reference Filter. The reference input is internally divided and available at this pin to provide
the reference for the
-
modulator. Connect an external 22
F (5 V min) tantalum capacitor from
REFCAP1 to AGND3 to filter the external reference noise.
24
REFCAP2
Reference Filter. The reference input is internally divided and available at this pin.
25
REFIN
Reference Input. This input accepts a 3 V level that is internally divided to provide the reference for
the
Σ- modulator.
27
AGND2
Analog Ground.
28
MODIN
Modulator Input. Analog input to the modulator. Normally, this input is directly tied to
PGAOUT output.
AD1556 PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Description
1, 21, 27, 28,
NC
No Connect
33
2–6
PGA0–PGA4
PGA and MUX Control Inputs. Sets the logic level of CB0-CB4 output pins respectively and the
state of the corresponding bit in the configuration register upon RESET or when in hardware mode.
Refer to Table III.
7–9
BW0–BW2
Output Rate Control Inputs. Sets the digital filter decimation rate and the state of the correspond-
ing bit in the configuration register upon RESET or when in hardware mode. Refer to the Filter
Specifications and Table VI.
10
H/
S
Hardware/Software Mode Select. Determines how the device operation is controlled. In hardware
mode, H/
S is high, the state of hardware pins set the mode of operation. When H/S is low, a write
sequence to the Configuration Register or a previous write sequence sets the device operation.
11, 22, 44
VL
Positive Digital Supply Voltage. 3.3 V or 5 V nominal.
12, 23, 24, 34
DGND
Digital Ground
13
SCLK
Serial Data Clock. Synchronizes data transfer to either write data on the DIN input pin or read
data on the DOUT output pin.
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