參數(shù)資料
型號(hào)： AD7924BRU
廠商： ANALOG DEVICES INC
元件分類(lèi)： ADC
英文描述： 4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 16-Lead TSSOP
中文描述： 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封裝： MO-153AB, TSSOP-16
文件頁(yè)數(shù)： 19/24頁(yè)
文件大?。?/td> 411K
代理商： AD7924BRU
AD7904/AD7914/AD7924
–19–
REV. 0
CS
SCLK
DOUT
DIN
1
14
16
1
14
16
PART IS IN FULL
SHUTDOWN
PART BEGINS TO POWER UP ON
CS
RISING EDGE AS PM1 = PM0 = 1
THE PART IS FULLY POWERED UP
ONCE
t
POWER UP
HAS ELAPSED
CONTROL REGISTER IS LOADED ON THE
FIRST 12 CLOCKS. PM1 = 1, PM0 = 1
TO KEEP THE PART IN NORMAL MODE, LOAD
PM1 = PM0 = 1 IN CONTROL REGISTER
CHANNEL IDENTIFIER BITS + CONVERSION RESULT
DATA IN TO CONTROL REGISTER
DATA IN TO CONTROL REGISTER
t
12
Figure 12. Full Shutdown Mode Operation
1
CS
SCLK
DOUT
DIN
16
1
16
1
16
DUMMY CONVERSION
CHANNEL IDENTIFIER BITS + CONVERSION RESULT
INVALID DATA
CHANNEL IDENTIFIER BITS + CONVERSION RESULT
DATA IN TO CONTROL REGISTER
PART ENTERS
SHUTDOWN ON
CS
RISING EDGE AS
PM1 0, PM0 1
CONTROL REGISTER IS LOADED ON THE
FIRST 12 CLOCKS, PM1 0, PM0 1
DATA IN TO CONTROL REGISTER
CONTROL REGISTER CONTENTS SHOULD
NOT CHANGE, WRITE BIT 0
TO KEEP PART IN THIS MODE, LOAD PM1 0, PM0 1
IN CONTROL REGISTER OR SET WRITE BIT = 0
PART IS FULLY
POWERED UP
PART BEGINS
TO POWER
UP ON
CS
FALLING EDGE
PART ENTERS
SHUTDOWN ON
CS
RISING EDGE AS
PM1 0, PM0 1
12
12
12
Figure 13. Auto Shutdown Mode Operation
Powering Up the AD7904/AD7914/AD7924
When supplies are first applied to the AD7904/AD7914/AD7924,
the ADC may power up in any of the operating modes of the
part. To ensure the part is placed into the required operating
mode the user should perform a dummy cycle operation as
outlined in Figures 14a through 14c.
The dummy conversion operation must be performed to place the
part into the desired mode of operation. To ensure the part is in
normal mode, this dummy cycle operation can be performed
with
the DIN line tied HIGH, i.e., PM1, PM0 = 1,1 (depending
on
other required settings in the control register) but the minimum
power-up time of 1
μ
s must be allowed from the rising edge
of
CS
, where the control register is updated, before attempting
the first valid conversion. This is to allow for the possibility that
the part initially powered up in shutdown. If the desired mode
of operation is Full Shutdown, then again only one dummy cycle
is required after supplies are applied. In this dummy cycle the
user simply sets the power management bits, PM1, PM0 = 1,0
and upon the rising edge of
CS
at the end of that serial transfer
the part will enter full shutdown.
If the desired mode of operation is Auto Shutdown after sup-
plies are applied, then two dummy cycles will be required, the
first with DIN tied high and the second dummy cycle to set the
power management bits PM1 and PM0 = 0,1. On the second
CS
rising edge after the supplies are applied, the Control Regis-
ter will contain the correct information and the part will enter
Auto Shutdown mode as programmed. If power consumption is
of critical concern, then in the first dummy cycle the user may
set PM1, PM0 = 1,0, i.e., Full Shutdown, and then place the
part into Auto Shutdown in the second dummy cycle. For illus-
tration purposes, Figure 14c is shown with DIN tied high on the
first dummy cycle in this case.
Figures 14a, 14b, and 14c each show the required dummy cycle(s)
after supplies are applied in the case of Normal mode, Full
Shutdown mode, or Auto Shutdown mode, respectively, being
the desired mode of operation.
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