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| 型号： | AD7952BSTZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT DIFF 1MSPS 48-LQFP |
| 标准包装： | 2,000 |
| 系列： | PulSAR® |
| 位数： | 14 |
| 采样率（每秒）： | 1M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 260mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
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Data Sheet
AD7952
Rev. A | Page 17 of 32
THEORY OF OPERATION
SW+
COMP
SW–
IN+
REF
REFGND
LSB
MSB
8192C
4096C
4C
2C
C
CONTROL
LOGIC
SWITCHES
CONTROL
BUSY
OUTPUT
CODE
CNVST
IN–
4C
2C
C
LSB
MSB
AGND
8192C
4096C
06
58
9
-02
5
Figure 25. ADC Simplified Schematic
OVERVIEW
The AD7952 is a very fast, low power, precise, 14-bit ADC using
successive approximation, capacitive digital-to-analog (CDAC)
converter architecture.
The AD7952 can be configured at any time for one of four input
ranges and conversion mode with inputs in parallel and serial
hardware modes or by a dedicated write-only, SPI-compatible
interface via a configuration register in serial software mode.
The AD7952 uses Analog Devices’ patented iCMOS high
voltage process to accommodate 0 V to +5 V, 0 V to +10 V,
±5 V, and ±10 V input ranges without the use of conventional
thin films. Only one acquisition cycle, t8, is required for the inputs
to latch to the correct configuration. Resetting or power cycling
is not required for reconfiguring the ADC.
The AD7952 features different modes to optimize performance
according to the applications. It is capable of converting
1,000,000 samples per second (1 MSPS) in warp mode, 800 kSPS
in normal mode, and 670 kSPS in impulse mode.
The AD7952 provides the user with an on-chip, track-and-hold,
successive approximation ADC that does not exhibit any
pipeline or latency, making it ideal for multiple, multiplexed
channel applications.
For unipolar input ranges, the AD7952 typically requires three
supplies: VCC, AVDD (which can supply DVDD), and OVDD
(which can be interfaced to either 5 V, 3.3 V, or 2.5 V digital
logic). For bipolar input ranges, the AD7952 requires the use of
the additional VEE supply.
The device is housed in Pb-free, 48-lead LQFP or tiny,
48-lead LFCSP (7 mm × 7 mm) that combines space savings
with flexibility. In addition, the AD7952 can be configured as
either a parallel or a serial SPI-compatible interface.
CONVERTER OPERATION
The AD7952 is a successive approximation ADC based on a
charge redistribution DAC. Figure 25 shows the simplified
schematic of the ADC. The CDAC consists of two identical
arrays of 16 binary weighted capacitors, which are connected
to the two comparator inputs.
During the acquisition phase, terminals of the array tied to the
comparator’s input are connected to AGND via SW+ and SW.
All independent switches are connected to the analog inputs.
Therefore, the capacitor arrays are used as sampling capacitors
and acquire the analog signal on IN+ and IN inputs. A
conversion phase is initiated once the acquisition phase is
completed and the CNVST input goes low. When the
conversion phase begins, SW+ and SW are opened first. The
two capacitor arrays are then disconnected from the inputs and
connected to the REFGND input. Therefore, the differential
voltage between the inputs (IN+ and IN) captured at the end
of the acquisition phase is applied to the comparator inputs,
causing the comparator to become unbalanced. By switching
each element of the capacitor array between REFGND and REF,
the comparator input varies by binary weighted voltage steps
(VREF/2, VREF/4 through VREF/16,384). The control logic toggles
these switches, starting with the MSB first, to bring the
comparator back into a balanced condition.
After the completion of this process, the control logic generates
the ADC output code and brings the BUSY output low.
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