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| 型号： | AD7298-1BCPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT SPI/SRL 8CH 20LFCSP |
| 标准包装： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 1M |
| 数据接口： | DSP，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 23mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-WQ（4x4） |
| 包装： | 标准包装 |
| 输入数目和类型： | 8 个单端，单极 |
| 其它名称： | AD7298-1BCPZ-RLDKR |
AD7298-1
Rev. A | Page 14 of 24
ADC Transfer Function
The output coding of the AD7298-1 is straight binary for the
analog input channel conversion results. The designed code
transitions occur at successive LSB values (that is, 1 LSB, 2 LSBs,
and so forth). The LSB size is VREF/1024 for the AD7298-1. The
ideal transfer characteristic for the AD7298-1 for straight binary
coding is shown in Figure 22.
111...111
111...110
111...000
011...111
000...010
000...001
000...000
1LSB = VREF/1024
ANALOG INPUT
NOTES
1. VREF IS 2.5V.
A
D
C
COD
E
+VREF – 1LSB
1LSB
0V
09321-
007
Figure 22. Straight Binary Transfer Characteristic
VDRIVE
The AD7298-1 also provides the VDRIVE feature. VDRIVE controls
the voltage at which the serial interface operates. VDRIVE allows
the ADC to easily interface to both 1.8 V and 3 V processors.
For example, if the AD7298-1 were operated with a VDD of
3.3 V, the VDRIVE pin could be powered from a 1.8 V supply.
This enables the AD7298-1 to operate with a larger dynamic
range with a VDD of 3.3 V while still being able to interface to
1.8 V processors. Take care to ensure VDRIVE does not exceed
section).
THE INTERNAL OR EXTERNAL REFERENCE
The AD7298-1 can operate with either the internal 2.5 V on-chip
reference or an externally applied reference. The EXT_REF bit
in the control register is used to determine whether the internal
reference is used. If the EXT_REF bit is selected in the control
register, an external reference can be supplied through the VREF
pin. At power-up, the internal reference is enabled. Suitable
external reference sources for the AD7298-1 include AD780,
The internal reference circuitry consists of a 2.5 V band gap
reference and a reference buffer. When the AD7298-1 is operated
in internal reference mode, the 2.5 V internal reference is
available at the VREF pin, which should be decoupled to GND1
using a 10 F capacitor. It is recommended that the internal
reference be buffered before applying it elsewhere in the system.
The internal reference is capable of sourcing up to 2 mA of current
when the converter is static. The reference buffer requires 5.5 ms to
power up and charge the 10 F decoupling capacitor during the
power-up time.
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