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AD8400 の電気的特性と機能

AD8400のメーカーはAnalog Devicesです、この部品の機能は「1-/2-/4-Channel Digital Potentiometers」です。


製品の詳細 ( Datasheet PDF )

部品番号 AD8400
部品説明 1-/2-/4-Channel Digital Potentiometers
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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AD8400 Datasheet, AD8400 PDF,ピン配置, 機能
FEATURES
256-position variable resistance device
Replaces 1, 2, or 4 potentiometers
1 k, 10 k, 50 k, 100 k
Power shutdown—less than 5 μA
3-wire,SPI-compatible serial data input
10 MHz update data loading rate
2.7 V to 5.5 V single-supply operation
Qualified for automotive applications
APPLICATIONS
Mechanical potentiometer replacement
Programmable filters, delays, time constants
Volume control, panning
Line impedance matching
Power supply adjustment
GENERAL DESCRIPTION
The AD8400/AD8402/AD8403 provide a single-, dual-, or
quad-channel, 256-position, digitally controlled variable resistor
(VR) device.1 These devices perform the same electronic adjust-
ment function as a mechanical potentiometer or variable
resistor. The AD8400 contains a single variable resistor in the
compact SOIC-8 package. The AD8402 contains two independent
variable resistors in space-saving SOIC-14 surface-mount
packages. The AD8403 contains four independent variable
resistors in 24-lead PDIP, SOIC, and TSSOP packages. Each
part contains a fixed resistor with a wiper contact that taps the
fixed resistor value at a point determined by the digital code
loaded into the controlling serial input register. The resistance
between the wiper and either endpoint of the fixed resistor
varies linearly with respect to the digital code transferred into
the VR latch. Each variable resistor offers a completely
programmable value of resistance between the A terminal and
the wiper or the B terminal and the wiper. The fixed A-to-B
terminal resistance of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a ±1%
channel-to-channel matching tolerance with a nominal
temperature coefficient of 500 ppm/°C. A unique switching
circuit minimizes the high glitch inherent in traditional
switched resistor designs, avoiding any make-before-break
or break-before-make operation.
(continued on Page 3)
1 The terms digital potentiometer, VR, and RDAC are used interchangeably.
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
1-/2-/4-Channel
Digital Potentiometers
AD8400/AD8402/AD8403
FUNCTIONAL BLOCK DIAGRAM
VDD
DGND
SDI
CLK
CS
AD8403
DAC
SELECT
1
2
3
A1, A0 4
2
10-BIT
SERIAL 8
LATCH
D
CK Q RS
8-BIT 8 RDAC1
LATCH
CK RS
SHDN
RDAC2
8-BIT 8
LATCH
CK RS
SHDN
RDAC3
8-BIT 8
LATCH
CK RS
SHDN
RDAC4
8-BIT 8
LATCH
CK RS
SHDN
A1
W1
B1
AGND1
A2
W2
B2
AGND2
A3
W3
B3
AGND3
A4
W4
B4
AGND4
SDO
RS SHDN
Figure 1.
100
RWA
75
RWB
50
25
0
0 64 128 192 255
CODE (Decimal)
Figure 2. RWA and RWB vs. Code
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2010 Analog Devices, Inc. All rights reserved.

1 Page





AD8400 pdf, ピン配列
GENERAL DESCRIPTION
(continued from Page 1)
Each VR has its own VR latch that holds its programmed
resistance value. These VR latches are updated from an SPI-
compatible, serial-to-parallel shift register that is loaded from
a standard 3-wire, serial-input digital interface. Ten data bits
make up the data-word clocked into the serial input register.
The data-word is decoded where the first two bits determine
the address of the VR latch to be loaded, and the last eight bits
are the data. A serial data output pin at the opposite end of the
serial register allows simple daisy chaining in multiple VR
applications without additional external decoding logic.
The reset (RS) pin forces the wiper to midscale by loading 80H
into the VR latch. The SHDN pin forces the resistor to an end-
to-end open-circuit condition on the A terminal and shorts the
wiper to the B terminal, achieving a microwatt power shutdown
state. When SHDN is returned to logic high, the previous latch
settings put the wiper in the same resistance setting prior to
shutdown. The digital interface is still active in shutdown so
that code changes can be made that will produce new wiper
positions when the device is taken out of shutdown.
AD8400/AD8402/AD8403
The AD8400 is available in the SOIC-8 surface mount. The
AD8402 is available in both surface-mount (SOIC-14) and
14-lead PDIP packages, while the AD8403 is available in a
narrow-body, 24-lead PDIP and a 24-lead, surface-mount
package. The AD8402/AD8403 are also offered in the 1.1 mm
thin TSSOP-14/TSSOP-24 packages for PCMCIA applications.
All parts are guaranteed to operate over the extended industrial
temperature range of −40°C to +125°C.
Rev. E | Page 3 of 32


3Pages


AD8400 電子部品, 半導体
AD8400/AD8402/AD8403
ELECTRICAL CHARACTERISTICS—50 KΩ AND 100 KΩ VERSIONS
VDD = 3 V ± 10% or 5 V ± 10%, VA = VDD, VB = 0 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 2.
Parameter
Symbol
Conditions
DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs)
Resistor Differential NL2
R-DNL
RWB, VA = No Connect
Resistor Nonlinearity2
R-INL
RWB, VA = No Connect
Nominal Resistance3
RAB TA = 25°C, Model: AD840XYY50
RAB TA = 25°C, Model: AD840XYY100
Resistance Tempco
ΔRAB/ΔT
VAB = VDD, Wiper = No Connect
Wiper Resistance
RW VDD = 5V, IW = VDD/RAB
RW VDD = 3V, IW = VDD/RAB
Nominal Resistance Match
ΔR/RAB
CH 1 to CH 2, CH 3, or CH 4, VAB = VDD, TA = 25°C
DC CHARACTERISTICS POTENTIOMETER DIVIDER (Specifications Apply to All VRs)
Resolution
N
Integral Nonlinearity4
INL
Differential Nonlinearity4
DNL
VDD = 5 V
DNL VDD = 3 V, TA = 25°C
DNL VDD = 3 V, TA = −40°C to +85°C
Voltage Divider Tempco
ΔVW/ΔT
Code = 80H
Full-Scale Error
VWFSE
Code = FFH
Zero-Scale Error
VWZSE
Code = 00H
RESISTOR TERMINALS
Voltage Range5
Capacitance6 Ax, Bx
Capacitance6 Wx
VA, VB, VW
CA, CB
CW
f = 1 MHz, measured to GND, code = 80H
f = 1 MHz, measured to GND, code = 80H
Shutdown Current7
IA_SD VA = VDD, VB = 0 V, SHDN = 0
Shutdown Wiper Resistance
RW_SD
VA = VDD, VB = 0 V, SHDN = 0, VDD = 5 V
DIGITAL INPUTS AND OUTPUTS
Input Logic High
VIH VDD = 5 V
Input Logic Low
VIL VDD = 5 V
Input Logic High
VIH VDD = 3 V
Input Logic Low
VIL VDD = 3 V
Output Logic High
VOH RL = 2.2 kΩ to VDD
Output Logic Low
VOL IOL = 1.6 mA, VDD = 5 V
Input Current
Input Capacitance6
IIL VIN = 0 V or 5 V, VDD = 5 V
CIL
POWER SUPPLIES
Power Supply Range
VDD range
Supply Current (CMOS)
IDD
VIH = VDD or VIL = 0 V
Supply Current (TTL)8
IDD VIH = 2.4 V or 0.8 V, VDD = 5.5 V
Power Dissipation (CMOS)9
PDISS
VIH = VDD or VIL = 0 V, VDD = 5.5 V
Power Supply Sensitivity
PSS
VDD = 5 V ± 10%
PSS VDD = 3 V ± 10%
Min
−1
−2
35
70
8
−4
−1
−1
−1.5
−1
0
0
2.4
2.1
VDD − 0.1
2.7
Typ 1
±1/4
±1/2
50
100
500
50
200
0.2
±1
±1/4
±1/4
±1/2
15
−0.25
+0.1
15
80
0.01
100
5
0.01
0.9
0.0002
0.006
Max
+1
+2
65
130
100
1
+4
+1
+1
+1.5
0
+1
VDD
5
200
0.8
0.6
0.4
±1
5.5
5
4
27.5
0.001
0.03
Unit
LSB
LSB
ppm/°C
Ω
Ω
%
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
μA
Ω
V
V
V
V
V
V
μA
pF
V
μA
mA
μW
%/%
%/%
Rev. E | Page 6 of 32

6 Page



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共有リンク

Link :


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