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DS1808Z-050+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
1 of 17 072601
FEATURES
§ Two 32-position log-tapers
§ 60dB attenuation range:
–1dB per step (12 taps)
–2dB per step (12 taps)
–3dB per step (8 taps)
–90dB low-end attenuation
§ 2-Wire Interface Control
§ Power Supply: Dual ±12V
§ Maximum Voltage Across Potentiometers:
±12V
§ Standard Resistance Value: 45kW
§ Packages: 16-Pin SOIC
§ Operating Temperature: -40
o
C to +85
o
C
ORDERING INFORMATION
DS1808Z-050 16-Pin SOIC -40ºC to
+85ºC 45kΩ
DS1808Z-050/T&R 16-Pin SOIC -40ºC to
+85ºC 45kΩ
PIN ASSIGNMENT
L1
A0
V
CC
W0
W
H0
CE
H1
L0
V
B
1
12
11
10
9
7
13
15
6
5
4
3
2
14
A2
A1
SCL
SDA
8
GND
16
V
DD
PIN DESCRIPTION
V
CC
- +12V Supply
V
B
- -12V Supply (substrate bias)
V
DD
- 5V Digital Supply
H
0
, H
1
- High-end Terminals
L
0
, L
1
- Low-end Terminals
W
0
, W
1
- Wiper Terminals
SDA - 2-Wire Serial Data Input/Output
SCL - 2-Wire Clock Input
/CE - 2-Wire Interface Enable
GND - Ground
A0, A1, A2 - Address Pins
DESCRIPTION
The DS1808 is a dual-channel, digitally controlled, log-taper potentiometer. Each potentiometer is
comprised of 32 wiper terminal positions plus a mute position. The device has three accessible
potentiometer terminals that include the high-side terminal (H), the low-side terminal (L), and the wiper
terminal (W). The resolution of the DS1808 is shown in Figure 8 and represents 1dB per step for the first
12 taps, 2dB per step for the next 12 taps and 3dB per step for the bottom 8 taps, providing a total
attenuation range of 60dB. The mute position of the DS1808 provides greater than 90dB of attenuation.
The wiper position on the resistor ladder is selected via a 6-bit register, whose value is controlled by the
industry-standard 2-wire interface. The interface consists of two control signals: SDA and SCL. The
DS1808 is available in a standard 45kW resistor value. The DS1808 is specified to operate over the
industrial temperature range (-40
o
C to +85
o
C) and is available in the 16-pin SOIC package. The DS1808
was designed for low-cost, stereo volume control applications. The device is specified to operate from
±12V
±10% supplies and accept a maximum input signal range of ±12V.
DS1808
Dual Log Digital Potentiomete
r
www.maxim-ic.com
16-Pin SOIC (150-mil)
DS1808
2 of 17
DS1808 BLOCK DIAGRAM Figure 1
PIN DESCRIPTIONS
V
CC
– Power Supply Terminal. This pin acts as the positive rail. The DS1808 will support positive supply
voltages ranging from 5 to 13.2 volts. When V
CC
–V
B
is less than 8 volts the series wiper resistance will
increase up to 1kW. The value of V
DD
should never exceed V
CC
.
V
B
– Substrate Bias Supply. This pin acts as a negative rail. The DS1808 will support negative voltages
ranging from 0 to -13.2 volts. When V
CC
–V
B
is less than 8 volts the series wiper resistance will increase
up to 1kW.
V
DD –
DC Supply Terminal. 5V DC voltage supply. The value of V
DD
should never exceed V
CC
.
GND – Ground Terminal.
SDA – 2-wire serial data interface. The serial data pin is for serial data transfer to and from the DS1808.
The pin is open drain and may be wire-ORed with other open drain or open collector interfaces.
SCL – 2-wire serial clock interface. The serial clock input is used to clock data into the DS1808 on rising
edges and clock data out on falling edges.
/CE – Port Enable Pin. When active (/CE=0), the port inputs SDA and SCL are recognized by the device.
If inactive (/CE=1), the port input pins SDA and SCL are disabled making 2-wire communication
impossible.
Control Logic
W
0
L
0
H
0
L
1
H
1
W
1
0dB0dB
>90dB
60dB
V
CC
(+12V Supply)
SCL
Power Supply V
B
(-12V Supply)
60dB
>90dB
SDA
GND
CE
V
DD
(5V Supply)
Address Lines
A0 – A2
DS1808
3 of 17
A0, A1, A2 – Address Inputs. These input pins specify the address of the device when used in a multi-
dropped configuration. Up to eight individual DS1808s may be addressed on a single 2-wire bus.
H0, H1 – These are the high-end terminals of the potentiometers. For both potentiometers, it is not
required that these terminals be connected to a potential greater than the low-end terminal of the
potentiometer. Voltage applied to the high end of the potentiometers cannot exceed the power supply
voltage, V
CC
, or go below V
B
.
L0, L1 – These are the low-end terminals of the potentiometers. It is not required that these terminals be
connected to a potential less than the high-end terminals of the pot. Voltage applied to the low end of the
potentiometers cannot exceed the power-supply voltage, V
CC
, or go below V
B
.
W0, W1 – Wiper of the Potentiometer. This pin is the wiper terminal of the potentiometer. Voltage
applied to either wiper terminal cannot exceed the power-supply voltage, V
CC
, or go below V
B
.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

DS1808Z-050+

Mfr. #:
Buy DS1808Z-050+
Manufacturer:
Maxim Integrated
Description:
Digital Potentiometer ICs Dual Log
Lifecycle:
New from this manufacturer.
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