參數(shù)資料
型號(hào)： AD7608BSTZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 15/32頁(yè)
文件大小： 0K
描述： IC DAS W/ADC 18BIT 8CH 64LQFP
標(biāo)準(zhǔn)包裝： 1,500
類(lèi)型： 數(shù)據(jù)采集系統(tǒng)（DAS），ADC
分辨率（位）： 18 b
采樣率（每秒）： 200k
數(shù)據(jù)接口： DSP，MICROWIRE?，并聯(lián)，QSPI?，串行，SPI?
電壓電源： 模擬和數(shù)字
電源電壓： 2.3 V ~ 5.25 V，4.75 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 帶卷 (TR)
AD7608
Data Sheet
Rev. A | Page 22 of 32
TYPICAL CONNECTION DIAGRAM
Figure 40 shows the typical connection diagram for the AD7608.
There are four AVCC supply pins on the part, and each of the
four pins should be decoupled using a 100 nF capacitor at each
supply pin and a 10 F capacitor at the supply source. The AD7608
can operate with the internal reference or an externally applied
reference. In this configuration, the AD7608 is configured to
operate with the internal reference. When using a single AD7608
device on the board, the REFIN/REFOUT pin should be
decoupled with a 10 F capacitor. Refer to the Internal/External
Reference section when using an application with multiple
AD7608 devices. The REFCAPA and REFCAPB pins are
shorted together and decoupled with a 10 F ceramic
capacitor.
The VDRIVE supply is connected to the same supply as the pro-
cessor. The VDRIVE voltage controls the voltage value of the
output logic signals. For layout, decoupling, and grounding
hints, see the Layout Guidelines section.
After supplies have been applied to the AD7608, apply a RESET
signal to the device to ensure it is configured for the correct
mode of operation.
POWER-DOWN MODES
There are two power-down modes available on the AD7608:
standby mode and shutdown mode. The
EE
AA
pin controls
whether the AD7608 is in normal mode or in one of the two
power-down modes.
STBY
The power-down mode is selected through the state of the
RANGE pin when the
AA
STBYEE
AA
pin is low. Table 7 shows the
configurations required to choose the desired power-down
mode. When the AD7608 is placed in standby mode, the
current consumption is 8 mA maximum and power-up time
is approximately 100 s because the capacitor on the REFCAPA
and REFCAPB pins must charge up. In standby mode, the
on-chip reference and regulators remain powered up, and the
amplifiers and ADC core are powered down.
When the AD7608 is placed in shutdown mode, the current
consumption is 11 A maximum and power-up time is approx-
imately 13 ms (external reference mode). In shutdown mode,
all circuitry is powered down. When the AD7608 is powered
up from shutdown mode, a RESET signal must be applied to
the AD7608 after the required power-up time has elapsed.
Table 7. Power-Down Mode Selection
Power-Down Mode
AA
STBYEE
RANGE
Standby
0
1
Shutdown
0
AVCC
AGND
VDRIVE
+
REFIN/REFOUT
DB0 TO DB15
CONVST A, B
CS
RD
BUSY
RESET
AD7608
1F
10F
100nF
DIGITAL SUPPLY
VOLTAGE +2.3V TO +5V
ANALOG SUPPLY
VOLTAGE 5V1
EIGHT ANALOG
INPUTS V1 TO V8
PARALLEL
INTERFACE
1DECOUPLING SHOWN ON THE AVCC PIN APPLIES TO EACH AVCC PIN (PIN 1, PIN 37, PIN 38, PIN 48).
DECOUPLING CAPACITOR CAN BE SHARED BETWEEN AVCC PIN 37 AND PIN 38.
2DECOUPLING SHOWN ON THE REGCAP PIN APPLIES TO EACH REGCAP PIN (PIN 36, PIN 39).
REGCAP2
+
10F
REFCAPA
REFCAPB
OS 2
OS 1
OS 0
OVERSAMPLING
100nF
V1
PAR/SER SEL
STBY
REF SELECT
RANGE
V2
V3
V4
V5
V6
V7
V8
REFGND
V1GND
V2GND
V3GND
V4GND
V5GND
V6GND
V7GND
V8GND
VDRIVE
M
ICRO
P
RO
CE
S
O
R/
M
ICRO
CO
NV
E
RT
E
R/
DS
P
08938-
038
Figure 40. Typical Connection Diagram
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