AD5207 Analog Devices, AD5207 Datasheet

no-image

AD5207

Manufacturer Part Number
AD5207
Description
Manufacturer
Analog Devices
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD5207
Manufacturer:
AD
Quantity:
11
Part Number:
AD5207
Quantity:
6
Part Number:
AD5207BR50
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD5207BRU100
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD5207BRUZ10
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
GENERAL DESCRIPTION
The AD5207 provides dual channel, 256-position, digitally
controlled variable resistor (VR) devices that perform the same
electronic adjustment function as a potentiometer or variable
resistor. Each channel of the AD5207 contains a fixed resistor with
a wiper contact that taps the fixed resistor value at a point
determined by a digital code loaded into the SPI-compatible
serial-input register. The resistance between the wiper and either
end point of the fixed resistor varies linearly with respect to the
digital code transferred into the VR latch. The 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 10 kΩ, 50 kΩ or 100 kΩ
has a ± 1% channel-to-channel matching tolerance with a nomi-
nal temperature coefficient of 500 ppm/°C. A unique switching
circuit minimizes the high glitch inherent in traditional switched
resistor designs and avoids any make-before-break or break-
before-make operation.
Each VR has its own VR latch, which holds its programmed
resistance value. These VR latches are updated from an internal
serial-to-parallel shift register, which is loaded from a standard
3-wire serial-input digital interface. Ten bits, to make up the
data word, are required and clocked into the serial input register.
The first two bits are address bits. The following eight bits are
the data bits that represent the 256 steps of the resistance value.
The reason for two address bits instead of one is to be compatible
with similar products such as AD8402 so that drop-in replacement
is possible. The address bit determines the corresponding VR
latch to be loaded with the data bits during the returned positive
edge of CS strobe. 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.
An internal reset block will force the wiper to the midscale posi-
tion during every power-up condition. The SHDN pin forces an
open circuit on the A Terminal and at the same time 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 remains active during shutdown;
code changes can be made to produce new wiper positions when
the device is resumed from shutdown.
The AD5207 is available in 1.1 mm thin TSSOP-14 package,
which is suitable for PCMCIA applications. All parts are guaran-
teed to operate over the extended industrial temperature range
of –40°C to +125°C.
DGND
SHDN
CLK
V
V
SDI
CS
DD
SS
FUNCTIONAL BLOCK DIAGRAM
2-Channel, 256-Position
LOGIC
RDAC1 REGISTER
A1
Digital Potentiometer
W1
SERIAL INPUT REGISTER
AD5207
B1
R
RDAC2 REGISTER
A2
8
W2
AD5207
POWER-
RESET
ON
R
B2
SDO

Related parts for AD5207

AD5207 Summary of contents

Page 1

... Each channel of the AD5207 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the SPI-compatible serial-input register ...

Page 2

... AD5207–SPECIFICATIONS ELECTRICAL CHARACTERISTICS 100 k VERSION –40 C < T < +125 C unless otherwise noted Parameter DC CHARACTERISTICS RHEOSTAT MODE Specifications Apply to All VRs 2 Resistor Differential Nonlinearity 2 Resistor Nonlinearity 3 Nominal Resistor Tolerance Resistance Temperature Coefficient Wiper Resistance Nominal Resistance Match ...

Page 3

... See timing diagram for location of measured values. All input control voltages are specified with t 1.5 V. Switching characteristics are measured using V 12 Propagation delay depends on value and The AD5207 contains 474 transistors. Die Size: 67 mil × 69 mil, 4623 sq. mil. Specifications subject to change without notice. (DATA IN) (DATA OUT) REV. 0 Conditions , t Clock Level High or Low ...

Page 4

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD5207 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 5

... CODE – Decimal Ω 0 5.5V 0.2 0.1 0.0 –0.1 –0.2 –0 128 160 192 CODE – Decimal Ω Typical Performance Characteristics–AD5207 0 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 224 256 0.1 0. 0.001 224 256 0.0 1 ...

Page 6

... AD5207 5. –40 – TEMPERATURE – C 160 140 120 100 – V SUPPLY 1000 900 800 700 600 500 SS 400 300 200 3V/0V DD ...

Page 7

... DATA = –14 1k 10k 100k FREQUENCY – Hz –5.99 –6.00 –6.01 –6.02 –6. +2. –2.7V SS –6. 100mV rms A DATA = 80 –6. –6. –6. –6.08 –6.09 1M 100 1M 10k 50k 1M AD5207 10k 50k 100k H OP42 1k 10k 100k FREQUENCY – Hz ...

Page 8

... AD5207 120 100 – 128 160 CODE – Decimal ∆ ∆ 2500 2000 1500 1000 500 0 500 0 ∆ 100.0 10.0 1.0 0.1 0 192 224 256 128 160 192 224 CODE – Decimal ∆ I WB_MAX R = 10k 50k ...

Page 9

... AD5207 address assignments to decode the location of VR latch receiving the serial register data in Bits B7 through B0. VR settings can be changed one at a time in random sequence. The AD5207 presets to a midscale during power-on condition. AD5207 contains a power shutdown SHDN pin. When activated in logic low. ...

Page 10

... CK RS CLK INTERNAL RS The target RDAC latch is loaded with the last eight bits of the data word to complete one RDAC update. For AD5207, it cannot update both channels simultaneously and therefore, two separate 10-bit data words must be clocked in to change both VR settings. AD5207 ...

Page 11

... LSB less than 5 V. Each LSB of voltage is equal to the voltage applied across terminal AB divided by the 256 position of the potentiometer divider. Since AD5207 is capable for dual supplies, the general equation defining the output volt- age with respect to ground for any given input voltage applied to terminals AB is: – ...

Page 12

... AD5207 TEST CIRCUITS Figures define the test conditions used in product Specification table. DUT LSB = V+/ CONNECT DUT DUT MS2 MS1 PSRR (dB LOG PSS (%/%) = ...

Page 13

... AD5207 Packages Comments µSOIC-10 Full AC Specs, Dual Supply, Pwr-On-Reset, Low Cost PDIP, SO-8, µSOIC-8 No Rollover, Pwr-On-Reset Single + Dual ± PDIP-14, SOL-16, TSSOP-14 Supply Operation µ ...

Page 14

... AD5207 SEATING OUTLINE DIMENSIONS Dimensions shown in inches and (mm) 14-Lead TSSOP (RU-14) 0.201 (5.10) 0.193 (4.90 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25 PIN 1 0.006 (0.15) 0.0433 (1.10) MAX 0.002 (0.05) 8 0.0118 (0.30) 0 0.0256 0.0079 (0.20) (0.65) 0.0075 (0.19) PLANE 0.0035 (0.090) BSC 0.028 (0.70) 0.020 (0.50) ...

Page 15

...

Page 16

–16– ...

Related keywords