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Micro Linear

ML2350 Datasheet Preview

ML2350 Datasheet

Programmable 8-Bit D/A Converters

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May 1997
ML2340*, ML2350**
Single Supply, Programmable
8-Bit D/A Converters
GENERAL DESCRIPTION
The ML2340 and ML2350 are CMOS voltage output, 8-bit
D/A converters with an internal voltage reference and a µP
interface. These devices are designed to be powered by a
single supply, although they can be powered from dual
power supplies. The output voltage swings above zero
scale (VZS) in the unipolar mode or around zero scale
(VZS) in the bipolar mode, both with programmable gain.
VZS can be set to any voltage from AGND to 2.25V below
VCC. The digital and analog grounds, DGND and AGND,
are totally independent of each other. DGND can be set to
any voltage from AGND to 4.5V below VCC for easy
interfacing to standard TTL and CMOS logic families.
The high level of integration and versatility of the ML2340
and ML2350 makes them ideal for a wide range of
applications in hard disk drives, automotive, telecom, and
a variety of general purpose industrial uses. One specific
intended application is controlling a hard disk voice coil.
The internal reference of the ML2340 provides a 2.25V or
4.50V output for use with A/D converters that use a single
5V ±10% power supply, while the ML2350 provide a
2.50V or 5.00V reference output.
FEATURES
s Programmable output voltage gain settings of 2, 1,
1/2, 1/4 provide 8-, 9-, 10-, or 11-bit effective resolution
around zero
s AGND to VCC output voltage swing
s Bipolar or unipolar output voltage
s 4.5V to 13.2V single supply or ±2.25V to ±6.5V
dual-supply operation
s Transparent latch allows microprocessor interface
with 30ns setup time
s Data flow-through mode
s Voltage reference output
ML2340 ........................................... 2.25V or 4.50V
ML2350 ........................................... 2.50V or 5.00V
s Nonlinearity .................................... ±1/4 LSB or ±1/2 LSB
s Output voltage settling time over temperature and
supply voltage tolerance
Within 1V of VCC and AGND ................... 2.5µs max
Within 100mV of VCC and AGND ............... 5µs max
s TTL and CMOS compatible digital inputs
s Low supply current (5V supply) ..................... 5mA max
s 18-pin DIP or surface mount SOlC
BLOCK DIAGRAM
VREFOUT
VZS
VREF
VCC
AGND
VREFIN
DGND
8-BIT D/A
DATA LATCH
DB0
XFER (LSB)
DB7
(MSB)
OP
AMP
+
VOUT
RESISTORS
SWITCHES
DECODERS
GAIN 0 GAIN 1
* This Part Is Obsolete
** This Part Is End Of Life As Of August 1, 2000
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Micro Linear

ML2350 Datasheet Preview

ML2350 Datasheet

Programmable 8-Bit D/A Converters

No Preview Available !

ML2340, ML2350
PIN CONNECTIONS
ML2340
ML2350
18-Pin DIP (P18)
VCC
VOUT
VZS
AGND
DGND
DB0
DB1
DB2
DB3
1 18
2 17
3 16
4 15
5 14
6 13
7 12
8 11
9 10
TOP VIEW
VREF IN
VREF OUT
GAIN 1
GAIN 0
XFER
DB7
DB6
DB5
DB4
ML2340
ML2350
18-Pin SOIC (S18W)
VCC
VOUT
VZS
AGND
DGND
DB0
DB1
DB2
DB3
1 18
2 17
3 16
4 15
5 14
6 13
7 12
8 11
9 10
TOP VIEW
VREF IN
VREF OUT
GAIN 1
GAIN 0
XFER
DB7
DB6
DB5
DB4
PIN DESCRIPTION
PIN NAME
1 VCC
2V OUT
3V ZS
4 AGND
5 DGND
6 DB0
7 DB1
FUNCTION
Positive supply.
Voltage output of the D/A converter.
VOUT is referenced to VZS.
Zero Scale Voltage. VOUT is referenced
to VZS. VZS is normally tied to AGND
in the unipolar mode or to mid-supply
in the bipolar mode. When the device
is operated from a single power
supply, VZS has a maximum current
requirement of –300µA in the bipolar
mode.
Analog ground.
Digital ground. This is the ground
reference level for all digital inputs.
The range is AGND - DGND - VCC
4.5V. DGND is normally tied to
system ground.
Data input — Bit 0 (LSB).
Data input — Bit 1.
PIN NAME
8 DB2
9 DB3
10 DB4
11 DB5
12 DB6
13 DB7
14 XFER
15 GAIN 0
16 GAIN 1
17 VREF OUT
18 VREF IN
FUNCTION
Data input — Bit 2.
Data input — Bit 3.
Data input — Bit 4.
Data input — Bit 5.
Data input — Bit 6.
Data input — Bit 7 (MSB).
Transfer enable input. The data is
transferred into the transparent latch at
the high level of XFER.
Digital gain setting input 0.
Digital gain setting input 1.
Voltage reference output. VREF OUT is
referenced to AGND. VREF OUT is set
to 2.5V and 5.0V in a low-voltage and
high-voltage operation, respectively
for the ML2350; 2.25V and 4.5V for
the ML2340.
Voltage reference input. VREF IN is
referenced to AGND.
2
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Part Number ML2350
Description Programmable 8-Bit D/A Converters
Maker Micro Linear
Total Page 12 Pages
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