参数资料
| 型号： | AD7676ASTZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DIFF INP 48LQFP |
| 标准包装： | 2,000 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 74mW |
| 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： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | EVAL-AD7676CBZ-ND - BOARD EVALUATION FOR AD7676 |
REV. B
AD7676
–10–
IN+
REF
REFGND
IN–
32,768C 16,384C
MSB
4C
2C
C
LSB
SW+
SWITCHES
CONTROL
32,768C 16,384C
MSB
4C
2C
C
LSB
SW–
BUSY
OUTPUT
CODE
CNVST
CONTROL
LOGIC
COMP
Figure 3. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7676 is a fast, low power, single-supply, precise 16-bit
analog-to-digital converter (ADC). The AD7676 is capable of
converting 500,000 samples per second (500 kSPS) and allows
power saving between conversions. When operating at 100 SPS,
for example, it typically consumes only 15
W. This feature
makes the AD7676 ideal for battery-powered applications.
The AD7676 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 AD7676 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 combines
space savings and allows flexible configurations as either serial
or parallel interface. The AD7676 is pin-to-pin compatible with
the AD7675.
CONVERTER OPERATION
The AD7676 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 two identical arrays of 16 binary weighted capacitors.
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.
Thus, the capacitor arrays are used as sampling capacitors and
acquire both analog signals.
When the acquisition phase is complete and the
CNVST input
goes or is low, a conversion phase is initiated. 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 output of 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 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 completion of this process, the control logic generates
the ADC output code and brings BUSY output LOW.
Transfer Functions
Using the OB/
2C digital input, the AD7676 offers two output
codings: straight binary and twos complement. The ideal transfer
characteristic for the AD7676 is shown in Figure 4.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
ADC
CODE
–
Straight
Binar
y
Figure 4. ADC Ideal Transfer Function
TEMPERATURE – C
5
3
–5
–55
135
–35
LSB
–15
–5
15
35
55
75
95
1
–1
–3
115
4
2
0
–2
–4
–FS
OFFSET
+FS
TPC 13. Drift vs. Temperature
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7677 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC |
| AD7677AAST | 制造商:Analog Devices 功能描述: |
| AD7677ACP | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD7677ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R |
| AD7677ACPZ | 功能描述:IC ADC 16BIT DIFF INP 48-LFCSP 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 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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