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DAC7615P Fiches technique(PDF) 10 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
No de pièce DAC7615P
Description  Quad, Serial Input, 12-Bit, Voltage Output DIGITAL-TO-ANALOG CONVERTER
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

DAC7615P Fiches technique(HTML) 10 Page - Burr-Brown (TI)

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®
10
DAC7615
REFERENCE INPUTS
The reference inputs, VREFL and VREFH, can be any voltage
between VSS + 2.25V and VDD – 2.25V provided that VREFH
is at least 1.25V greater than VREFL. The minimum output
of each DAC is equal to VREFL – 1LSB plus a small offset
voltage (essentially, the offset of the output op amp). The
maximum output is equal to VREFH plus a similar offset
voltage. Note that VSS (the negative power supply) must
either be connected to ground or must be in the range of –
4.75V to –5.25V. The voltage on VSS sets several bias
points within the converter. If VSS is not in one of these two
configurations, the bias values may be in error and proper
operation of the device is not guaranteed.
The current into the reference inputs depends on the DAC
output voltages and can vary from a few microamps to
approximately 0.6 milliamp. Bypassing the reference volt-
age or voltages with a 0.1
µF capacitor placed as close as
possible to the DAC7615 package is strongly recommended.
DIGITAL INTERFACE
Figure 3 and Table I provide the basic timing for the
DAC7615. The interface consists of a serial clock (CLK),
serial data (SDI), a load register signal (LOADREG), and a
“load all DAC registers” signal (LOADDACS). In addition,
a chip select (CS) input is available to enable serial commu-
nication when there are multiple serial devices. An asyn-
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
tDS
Data Valid to CLK Rising
25
ns
tDH
Data Held Valid after CLK Rises
20
ns
tCH
CLK HIGH
30
ns
tCL
CLK LOW
50
ns
tCSS
CS LOW to CLK Rising
55
ns
tCSH
CLK HIGH to CS Rising
15
ns
tLD1
LOADREG HIGH to CLK Rising
40
ns
tLD2
CLK Rising to LOADREG LOW
15
ns
tLDRW
LOADREG LOW Time
45
ns
tLDDW
LOADDACS LOW Time
45
ns
tRSSH
RESETSEL Valid to RESET LOW
25
ns
tRSTW
RESET LOW Time
70
ns
tS
Settling Time
10
µs
FIGURE 3. DAC7615 Timing.
chronous reset input (RESET) is provided to simplify start-
up conditions, periodic resets, or emergency resets to a
known state.
The DAC code and address are provided via a 16-bit serial
interface as shown in Figure 3. The first two bits select the
input register that will be updated when LOADREG goes
LOW (see Table II). The next two bits are not used. The last
12 bits are the DAC code which is provided, most significant
bit first.
TABLE I. Timing Specifications (TA = –40°C to +85°C).
A1
(MSB)
(LSB)
SDI
CLK
CS
LOADREG
A0
X
X
D11
D10
D9
D3
D2
D1
D0
SDI
CLK
LOADDACS
RESET
V
OUT
tcss
t
LD1
t
CL
t
CH
t
DS
t
DH
t
LD2
t
LDRW
t
LDDW
t
S
t
RSTW
t
RSSH
t
CSH
t
S
1 LSB
ERROR BAND
1 LSB
ERROR BAND
RESETSEL


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