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参数资料
| 型号： | AD7660ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT UNIPOLAR 48-LQFP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 25mW |
| 电压电源： | 模拟和数字 |
| 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： | 托盘 |
| 输入数目和类型： | 2 个伪差分，单极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
| 配用： | EVAL-AD7660CBZ-ND - BOARD EVALUATION FOR AD7660 |
REV. D
AD7660
–10–
CIRCUIT INFORMATION
The AD7660 is a fast, low power, single-supply, precise 16-bit
analog-to-digital converter (ADC). The AD7660 is capable of
converting 100,000 samples per second (100 kSPS) and allows
power saving between conversions. When operating at 100 SPS,
for example, it consumes typically only 21
mW. This feature
makes the AD7660 ideal for battery-powered applications.
The AD7660 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.
The AD7660 can be operated from a single 5 V supply and be
interfaced to either 5 V or 3 V digital logic. It is housed in a
48-lead LQFP package or a 48-lead LFCSP package that com-
bines space savings and allows flexible configurations as either
serial or parallel interface. The AD7660 is pin-to-pin compatible
with the AD7664.
CONVERTER OPERATION
The AD7660 is a successive-approximation analog-to-digital
converter based on a charge redistribution DAC. Figure 3 shows
the simplified schematic of the ADC. The capacitive DAC consists
of an array of 16 binary weighted capacitors and an additional
LSB capacitor. The comparator’s negative input is connected to
a “dummy” capacitor of the same value as the capacitive
DAC array.
During the acquisition phase, the common terminal of the array
tied to the comparator’s positive input is connected to AGND
via SWA. All independent switches are connected to the analog
input IN. Thus, the capacitor array is used as a sampling capaci-
tor and acquires the analog signal on IN input. Similarly, the
dummy capacitor acquires the analog signal on the INGND input.
When the acquisition phase is complete and the
CNVST input
goes or is LOW, a conversion phase is initiated. When the con-
version phase begins, SWA and SWB are opened first. The
capacitor array and the dummy capacitor are then disconnected
from the inputs and connected to the REFGND input. There-
fore, the differential voltage between IN and INGND 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
or REF, the comparator input varies by binary weighted voltage
steps (VREF/2, VREF/4 . . . VREF/65536). The control logic toggles
these switches, starting with the MSB first, in order to bring the
comparator back into a balanced condition. After the comple-
tion of this process, the control logic generates the ADC output
code and brings BUSY output LOW.
SWA
COMP
SWB
IN
REF
REFGND
LSB
MSB
32768C
INGND
16384C
4C
2C
C
65536C
CONTROL
LOGIC
SWITCHES
CONTROL
BUSY
OUTPUT
CODE
CNVST
C
Figure 3. ADC Simplified Schematic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7660ASTZ | 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD7660ASTZRL | 功能描述:IC ADC 16BIT UNIPOLAR 48LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 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 |
| AD7661 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 1 MSPS, Differential, Programmable Input PulSAR ADC |
| AD7661ACP | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 16-bit Parallel/Serial 48-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:100KSPS, 16-BIT ADC INT REF, 2.5LSB - Bulk 制造商:Analog Devices 功能描述:16BIT ADC INT REF 7661 LFSCP-48 |
| AD7661ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 100KSPS 16BIT PARALLEL/SERL 48LFCSP EP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:100KSPS, 16-BIT ADC INT REF, 2.5LSB - Tape and Reel |
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