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| 型号： | AD7699BCPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8CH 16BIT 500KSPS 20LFCSP |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 32mW |
| 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： | 20-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-VQ |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极；4 个差分，双极；4 个伪差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
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Data Sheet
AD7699
Rev.
| Page 17 of 28
GND
COM
CH0+
CH3+
CH1+
CH2+
CH4+
CH5+
CH6+
CH7+
CH0+
CH3+
CH1+
CH2+
CH4+
CH5+
CH6+
CH7+
COM–
GND
COM
IN1
IN0
IN2
IN3
IN4
IN5
IN6
IN7
IN1
IN0
IN2
IN3
IN4
IN5
IN6
IN7
IN1
IN0
IN2
IN3
IN4
IN5
IN6
IN7
IN1
IN0
IN2
IN3
IN4
IN5
IN6
IN7
A—8 CHANNELS,
SINGLE ENDED
B—8 CHANNELS,
COMMON REFERENCE
GND
COM
CH0+ (–)
CH1+ (–)
CH2+ (–)
CH3+ (–)
CH0– (+)
CH1– (+)
CH0+ (–)
CH1+ (–)
CH0– (+)
CH1– (+)
CH2– (+)
CH3– (+)
C—4 CHANNELS,
DIFFERENTIAL
GND
COM
CH2+
CH3+
CH4+
CH5+
D—COMBINATION
COM–
07
35
4-
02
9
Figure 31. Multiplexed Analog Input Configurations
The analog inputs can be configured as
Figure 31A, single-ended referenced to system ground;
CFG[12:10] = 1112.
Figure 31B, bipolar differential with a common reference
point; COM = VREF/2; CFG[12:10] = 0102.
Unipolar differential with COM connected to a ground
sense; CFG[12:10] = 1102.
Figure 31C, bipolar differential pairs with INx referenced
to VREF/2; CFG[12:10] = 00X2.
Unipolar differential pairs with INx referenced to a
ground sense; CFG[12:10] = 10X2.
In this configuration, the INx+ is identified by the channel
in CFG[9:7]. For example, for IN0 = IN1+ and IN1 =
IN1, CFG[9:7] = 0002; for IN1 = IN1+ and IN0 = IN1,
CFG[9:7] = 0012.
Figure 31D, inputs configured in any of the above
combinations (showing that the AD7699 can be configured
dynamically).
Sequencer
The AD7699 includes a channel sequencer useful for scanning
channels in a IN0 to IN[7:0] fashion. Channels are scanned as
singles or pairs, with or without the temperature sensor, after
the last channel is sequenced.
The sequencer starts with IN0 and finishes with IN[7:0] set in
CFG[9:7]. For paired channels, the channels are paired
depending on the last channel set in CFG[9:7]. Note that the
channel pairs are always paired as IN (even) = INx+ and IN
(odd) = INx regardless of CFG[7].
To enable the sequencer, CFG[2:1] are written to for initializing
the sequencer. After CFG[13:0] are updated, DIN must be held
low while reading data out (at least for Bit 13), or the CFG register
begins updating again.
While operating in a sequence, the CFG register can be changed
by writing 012 to CFG[2:1]. However, if changing CFG11 (paired
or single channel) or CFG[9:7] (last channel in sequence), the
sequence reinitializes and converts IN0 (or IN1) after CFG is
updated.
Examples
Bit[13], Bits[6:3], and Bit 0 are configured for the input and
sequencer.
As a first example, scan all IN[7:0] referenced to COM = GND
with the temperature sensor.
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CFG
INCC
INx
BW
REF
SEQ
RB
1
0
1
0
As a second example, scan three paired channels without the
temperature sensor and referenced to VREF/2.
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CFG
INCC
INx
BW
REF
SEQ
RB
0
1
1 X = don’t care.
Source Resistance
When the source impedance of the driving circuit is low, the
AD7699 can be driven directly. Large source impedances signifi-
cantly affect the ac performance, especially total harmonic
distortion (THD). The dc performances are less sensitive to the
input impedance. The maximum source impedance depends on
the amount of THD that can be tolerated. The THD degrades as a
function of the source impedance and the maximum input
frequency.
B
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