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| 型號： | AD7294BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/49頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT I2C/SRL 1M 56LFCSP |
| 標準包裝： | 1 |
| 類型： | ADC，DAC |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 22.22k |
| 數(shù)據(jù)接口： | I²C，串行 |
| 電壓電源： | 模擬和數(shù)字 |
| 電源電壓： | 4.4 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 56-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 56-LFCSP-VQ（8x8） |
| 包裝： | 托盤 |
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AD7294
Data Sheet
Rev. H | Page 20 of 48
THEORY OF OPERATION
ADC OVERVIEW
The AD7294 provides the user with a 9-channel multiplexer, an
on-chip track-and-hold, and a successive approximation ADC
based around a capacitive DAC. The analog input range for the
part can be selected as a 0 V to VREF input or a 2 × VREF input,
configured with either single-ended or differential analog inputs.
The AD7294 has an on-chip 2.5 V reference that can be disabled
when an external reference is preferred. If the internal ADC
reference is to be used elsewhere in a system, the output must
first be buffered.
The various monitored and uncommitted input signals are multi-
plexed into the ADC. The AD7294 has four uncommitted
analog input channels, VIN0 to VIN3. These four channels allow
single-ended, differential, and pseudo differential mode
measurements of various system signals.
ADC TRANSFER FUNCTIONS
The designed code transitions occur at successive integer LSB
values (1 LSB, 2 LSB, and so on). In single-ended mode, the
LSB size is VREF/4096 when the 0 V to VREF range is used and
2 × VREF/4096 when the 0 V to 2 × VREF range is used. The ideal
transfer characteristic for the ADC when outputting straight
binary coding is shown in Figure 35.
000...000
111...111
1LSB = VREF/4096
1LSB
VREF – 1LSB
ANALOG INPUT
ADC
CO
DE
0V
000...001
000...010
111...110
111...000
011...111
NOTE
1. VREF IS EITHER VREF OR 2 × VREF.
05747-
016
Figure 35. Single-Ended Transfer Characteristic
In differential mode, the LSB size is 2 × VREF/4096 when the 0 V
to VREF range is used, and 4 × VREF/4096 when the 0 V to 2 × VREF
range is used. The ideal transfer characteristic for the ADC when
outputting twos complement coding is shown in Figure 36 (with
the 2 × VREF range).
100...000
011...111
1LSB = 2 × VREF/4096
+VREF – 1LSB
–VREF + 1LSB VREF – 1LSB
ANALOG INPUT
ADC
CO
DE
100...001
100...010
011...110
000...001
000...000
111...111
05747-
017
Figure 36. Differential Transfer Characteristic with VREF ± VREF Input Range
For VIN0 to VIN3 in single-ended mode, the output code is
straight binary, where
VIN = 0 V, DOUT = x000, VIN = VREF 1 LSB, and DOUT = xFFF
In differential mode, the code is twos complement, where
VIN+ VIN = 0 V, and DOUT = x00
VIN+ VIN = VREF 1 LSB, and DOUT = x7FF
VIN+ VIN = VREF, and DOUT = x800
Channel 5 and Channel 6 (current sensor inputs) are twos
complement, where
VIN+ VIN = 0 mV, and DOUT = x000
VIN+ VIN = VREF/12.5 1 LSB, DOUT = x7FF
VIN+ VIN = VREF/12.5, DOUT = x800
Channel 7 to Channel 9 (temperature sensor inputs) are twos
complement with the LSB equal to 0.25°C, where
TIN = 0°C, and DOUT = x000
TIN = +255.75°C, and DOUT = x7FF
TIN = 256°C, and DOUT = x800
ANALOG INPUTS
The AD7294 has a total of four analog inputs. Depending on
the configuration register setup, they can be configured as two
single-ended inputs, two pseudo differential channels, or two
fully differential channels. See the Register Setting section for
further details.
Single-Ended Mode
The AD7294 can have four single-ended analog input channels.
In applications where the signal source has high impedance, it is
recommended to buffer the analog input before applying it to the
ADC. The analog input range can be programmed to be either
0 V to VREF or 0 V to 2 × VREF. In 2 × VREF mode, the input is
effectively divided by 2 before the conversion takes place. Note
that the voltage with respect to GND on the ADC analog input
pins cannot exceed AVDD.
If the analog input signal to be sampled is bipolar, the internal
reference of the ADC can be used to externally bias up this
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