Datenblatt-pdf.com


DS1808 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer DS1808
Beschreibung Addressable Dual Audio Taper Potentiometer
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 17 Seiten
DS1808 Datasheet, Funktion
DS1808
Dual Log Digital Potentiometer
www.maxim-ic.com
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: -40oC to +85oC
PIN ASSIGNMENT
GND
A2
A1
VB
A0
W0
L0
H0
1
2
3
4
5
6
7
8
16 VDD
15 VCC
14 SCL
13 SDA
12 CE
11 W
10 H1
9 L1
16-Pin SOIC (150-mil)
ORDERING INFORMATION
DS1808Z-050
16-Pin SOIC -40ºC to
+85ºC 45k
DS1808Z-050/T&R 16-Pin SOIC -40ºC to
+85ºC 45k
PIN DESCRIPTION
VCC
VB
VDD
H0, H1
L0, L1
W0, W1
SDA
- +12V Supply
- -12V Supply (substrate bias)
- 5V Digital Supply
- High-end Terminals
- Low-end Terminals
- Wiper Terminals
- 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 (-40oC to +85oC) 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.
1 of 17
072601






DS1808 Datasheet, Funktion
DS1808
The master device generates all serial clock pulses and the start and stop conditions. A transfer is ended
with a stop condition or with a repeated start condition. Since a repeated start condition is also the
beginning of the next serial transfer, the bus will not be released.
The DS1808 may operate in the following two modes:
1. Slave receiver mode: Serial data and clock are received through SDA and SCL respectively. After
each byte is received, an acknowledge bit is transmitted. Start and stop conditions are recognized as
the beginning and end of a serial transfer. Address recognition is performed by hardware after
reception of the slave (device) address and direction bit.
2. Slave transmitter mode: The first byte is received and handled as in the slave receiver mode.
However, in this mode the direction bit will indicate that the transfer direction is reversed. Serial data
is transmitted on SDA by the DS1808 while the serial clock is input on SCL. Start and stop conditions
are recognized as the beginning and end of a serial transfer.
3. Slave Address: command/control byte is the first byte received following the start condition from the
master device. The command/control byte consists of a 4-bit control code. For the DS1808, this is set
as 0101 binary for read/write operations. The next three bits of the command/control byte are the
device select bits or slave address (A2, A1, A0). They are used by the master device to select which
of eight devices is to be accessed. When reading or writing the DS1808, the device select bits must
match the device select pins (A2, A1, A0). The last bit of the command/control byte (R/W) defines
the operation to be performed. When set to a 1, a read operation is selected, and when set to a 0, a
write operation is selected.
Following the START condition, the DS1808 monitors the SDA bus checking the device type identifier
being transmitted. Upon receiving the 0101 control code, the appropriate device address bits, and the
read/write bit, the slave device outputs an acknowledge signal on the SDA line.
COMMAND AND PROTOCOL
The command and protocol structure of the DS1808 allows the user to read from or write to the
potentiometer(s). Additionally, the 2-wire command/protocol structure of the DS1808 will support eight
different devices and a maximum of 16 channels that can be uniquely controlled. The command
structures for the device are presented in Figures 3, 4, 5, and 6. Potentiometer data values and
command/control values are always transmitted most significant bit (MSB) first. During communications,
the receiving unit always generates the acknowledgement.
6 of 17

6 Page









DS1808 pdf, datenblatt
DS1808
ANALOG RESISTOR CHARACTERISTICS
(-40°C to +85°C/VCC, VB=±5V to ±13.2V/VDD=4.5V to 5.5V)
PARAMETER
SYMBOL CONDITION MIN TYP MAX UNITS NOTES
End-to-End
Resistance
Total Resistance
-20 +20
45kW
%
Absolute Linearity
Relative Linearity
Interchannel
Matching
-3 dB Cutoff
frequency
Output Noise (20Hz
to 20kHz, Grounded
Input, Tap = -6dB)
Total Harmonic
Distortion
Interchannel Isolation
(20Hz to 20kHz,
Grounded Input,
Tap = -6dB)
Mute Position
Wiper Resistance
Wiper Current
Resistor Inputs
Temperature
Coefficient
fcutoff
THD+N
RW
IW
L,H,W
-0.5
-0.25
-0.5
+0.5
+0.25
+0.5
LSB
LSB
dB
5 MHz
2.2 mVRMS
9
10
0.001
-100
%
dB
-90 dB
300 600
W
1 mA
VB VCC V
750
ppm/°C
11
CAPACITANCE
PARAMETER
Input Capacitance
SYMBOL CONDITION
CIN
MIN
TYP
MAX UNITS NOTES
10 pF
12 of 17

12 Page





SeitenGesamt 17 Seiten
PDF Download[ DS1808 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
DS1800Dual Inverting Log Gain/AttenuatorDallas Semiconducotr
Dallas Semiconducotr
DS1800-3AC-DC / Distributed Power Front-End 1UEmerson
Emerson
DS1801Dual Audio Taper PotentiometerDallas Semiconducotr
Dallas Semiconducotr
DS1802Dual Audio Taper Potentiometer With Pushbutton ControlDallas Semiconducotr
Dallas Semiconducotr
DS1803Addressable Dual Digital PotentiometerDallas Semiconducotr
Dallas Semiconducotr

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche