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参数资料
| 型号： | AD7477AAKSZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | GT 12C 6#12 6#16 PIN RECP WALL |
| 中文描述： | 1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO6 |
| 封装： | ROHS COMPLIANT, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 15/24页 |
| 文件大小： | 580K |
| 代理商： | AD7477AAKSZ-REEL7 |
REV. C
AD7476A/AD7477A/AD7478A
–15–
TYPICAL CONNECTION DIAGRAM
Figure 7 shows a typical connection diagram for the AD7476A/
AD7477A/AD7478A. V
REF
is taken internally from V
DD
and, as
such, V
DD
should be well decoupled. This provides an analog
input range of 0 V to V
DD
. The conversion result is output in a
16-bit word with four leading zeros followed by the MSB of the
12-bit, 10-bit, or 8-bit result. The 10-bit result from the AD7477A
will be followed by two trailing zeros, and the 8-bit result from
the AD7478A will be followed by four trailing zeros.
Alternatively, because the supply current required by the AD7476A/
AD7477A/AD7478A is so low, a precision reference can be used
as the supply source to the AD7476A/AD7477A/AD7478A. A
REF19x voltage reference (REF195 for 5 V or REF193 for 3 V)
can be used to supply the required voltage to the ADC (see Figure 7).
This configuration is especially useful if the power supply is
quite noisy or if the system supply voltages are at some value
other than 5 V or 3 V (e.g., 15 V). The REF19x will output a
steady voltage to the AD7476A/AD7477A/AD7478A. If the low
dropout REF193 is used, the current it needs to supply to the
AD7476A/AD7477A/AD7478A is typically 1.2 mA. When
the ADC is converting at a rate of 1 MSPS, the REF193 will
need to supply a maximum of 1.7 mA to the AD7476A/
AD7477A/AD7478A. The load regulation of the REF193 is typi-
cally 10 ppm/mA (V
S
= 5 V), which results in an error of 17 ppm
(51
μ
V) for the 1.7 mA
drawn from it. This corresponds to a
0.069 LSB
error for the AD7476A with V
DD
= 3 V from the
REF193, a 0.017 LSB error for the AD7477A, and a 0.0043 LSB
error for the AD7478A. For applications where power consumption
is of concern, the power-down mode of the ADC and
the sleep
mode of the REF19x reference should be used to
improve
power performance. See the Modes of Operation section.
AD7476A/
AD7477A/
AD7478A
SCLK
SDATA
CS
V
IN
GND
0V TO V
INPUT
V
DD
C/ P
SERIAL
INTERFACE
0.1 F
1 F
TANT
REF193
1.2mA
680nF
10 F
0.1 F
3V
5V
SUPPLY
Figure 7. REF193 as Power Supply to AD7476A/
AD7477A/AD7478A
Table I provides some typical performance data with various
references used as a V
DD
source for a 100 kHz input tone at
room temperature under the same setup conditions.
Table I. AD7476A Typical Performance for Various
Voltage References IC
Reference Tied
to V
DD
AD780 @ 3 V
REF193
AD780 @ 2.5 V
REF192
REF43
AD7476A SNR Performance
(dB)
72.65
72.35
72.5
72.2
72.6
Analog Input
Figure 8 shows an equivalent circuit of the analog input structure
of the AD7476A/AD7477A/AD7478A. The two diodes, D1 and
D2, provide ESD protection for the analog input. Care must be
taken to ensure that the analog input signal never exceeds the
supply rails by more than 300 mV. This will cause these diodes
to become forward-biased and start conducting current into the
substrate. The maximum current these diodes can conduct
without causing irreversible damage to the part is 10 mA. The
capacitor C1 in Figure 8 is typically about 6 pF and can primarily
be attributed to pin capacitance. The resistor R1 is a lumped
component made up of the on resistance of a switch. This resistor
is typically about 100
. The capacitor C2 is the ADC sampling
capacitor and has a capacitance of
20 pF typically. For ac applica-
tions, removing high frequency components from the analog input
signal is recommended by use of a band-pass filter on the relevant
analog input pin. In applications where harmonic distortion and
signal-to-noise ratio are critical, the analog input should be driven
from a low impedance source. Large source impedances will
significantly affect the ac performance of the ADC. This may
necessitate the use of an input buffer amplifier. The choice of
the op amp will be a function of the particular application.
D1
D2
R1
C2
20pF
V
DD
V
IN
C1
6pF
CONVERSION PHASE – SWITCH OPEN
TRACK PHASE – SWITCH CLOSED
Figure 8. Equivalent Analog Input Circuit
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|---|---|
| AD7477AAKSZ-REEL73 | 制造商:AD 制造商全称:Analog Devices 功能描述:2.35 V to 5.25 V, 1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SC70 |
| AD7477AARM | 制造商:Rochester Electronics LLC 功能描述:10-BIT LOW POWER ADC IN USOIC PKG I.C - Bulk 制造商:Analog Devices 功能描述:IC 10BIT ADC SMD 7477 MSOP8 |
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| AD7477AARM-REEL7 | 制造商:Rochester Electronics LLC 功能描述:10-BIT LOW POWER ADC IN USOIC PKG I.C - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD7477AARMZ | 功能描述:IC ADC 10BIT 1MSPS 8-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 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-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
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