参数资料
型号: EVAL-AD7654CBZ
厂商: Analog Devices Inc
文件页数: 6/28页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7654
标准包装: 1
系列: PulSAR®
ADC 的数量: 2
位数: 16
采样率(每秒): 500k
数据接口: 串行,并联
输入范围: 0 ~ 5 V
在以下条件下的电源(标准): 120mW @ 500kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7654
已供物品:
相关产品: AD7654ACPZ-ND - IC ADC 16BIT DUAL 2CH 48-LFCSP
AD7654ASTZRL-ND - IC ADC 16BIT DUAL 2CH 48LQFP
AD7654ACPZRL-ND - IC ADC 16BIT DUAL 2CH 48LFCSP
AD7654ASTZ-ND - IC ADC 16BIT 500KSPS DUAL 48LQFP
AD7654
Rev. B | Page 14 of 28
APPLICATION INFORMATION
CIRCUIT INFORMATION
The AD7654 is a very fast, low power, single-supply, precise,
simultaneous sampling 16-bit ADC.
The AD7654 provides the user with two on-chip, track-and-
hold, successive approximation ADCs that do not exhibit any
pipeline or latency, making it ideal for multiple multiplexed
channel applications. The AD7654 can also be used as a
4-channel ADC with two pairs simultaneously sampled.
The AD7654 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 or tiny 48-lead LFCSP that combines space
savings and allows flexible configurations as either a serial or
parallel interface. The AD7654 is pin-to-pin compatible with
PulSAR ADCs.
MODES OF OPERATION
The AD7654 features two modes of operation, normal and
impulse. Each of these modes is more suitable for specific
applications.
Normal mode is the fastest mode (500 kSPS). Except when it is
powered down (PD = HIGH), the power dissipation is almost
independent of the sampling rate.
Impulse mode, the lowest power dissipation mode, allows
power saving between conversions. The maximum
throughput in this mode is 444 kSPS. When operating at
10 kSPS, for example, it typically consumes only 2.6 mW. This
feature makes the AD7654 ideal for battery-powered
applications.
TRANSFER FUNCTIONS
The AD7654 data format is straight binary. The ideal transfer
characteristic for the AD7654 is shown in Figure 17 and Table 7.
The LSB size is 2*VREF/65536, which is about 76.3 μV.
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
CO
DE
(
S
tr
ai
g
h
tBi
n
ar
y)
03
05
7-
0
17
Figure 17. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 2.5 V
Digital Output Code
FSR 1 LSB
4.999924 V
FSR 2 LSB
4.999847 V
0xFFFE
Midscale + 1 LSB
2.500076 V
0x8001
Midscale
2.5 V
0x8000
Midscale 1 LSB
2.499924 V
0x7FFF
FSR + 1 LSB
76.29 μV
0x0001
FSR
0 V
1 This is also the code for overrange analog input
(VINx – VINxN above 2 × (VREF VREFGND)).
2 This is also the code for underrange analog input (VINx below VINxN).
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