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SoftSpan DACs. LTC2704 Datasheet |
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FEATURES
n Six Programmable Output Ranges:
Unipolar: 0V to 5V, 0V to 10V
Bipolar: ±5V, ±10V, ±2.5V, –2.5V to 7.5V
n Serial Readback of All On-Chip Registers
n 1LSB INL and DNL Over the Industrial
Temperature Range (LTC2704-14/LTC2704-12)
n Force/Sense Outputs Enable Remote Sensing
n Glitch Impulse: < 2nV-sec
n Outputs Drive ±5mA
n Pin Compatible 12-, 14- and 16-Bit Parts
n Power-On and Clear to Zero Volts
n 44-Lead SSOP Package
APPLICATIONS
n Process Control and Industrial Automation
n Direct Digital Waveform Generation
n Software Controlled Gain Adjustment
n Automated Test Equipment
LTC2704
Quad 12-, 14- and 16-Bit
Voltage Output SoftSpan
DACs with Readback
DESCRIPTION
The LTC®2704-16/LTC2704-14/LTC2704-12 are serial
input, 12-, 14- or 16-bit, voltage output SoftSpan™ DACs
that operate from 3V to 5V logic and ±5V to ±15V analog
supplies. SoftSpan offers six output spans—two unipolar
and four bipolar—fully programmable through the 3-wire
SPI serial interface. INL is accurate to 1LSB (2LSB for the
LTC2704-16). DNL is accurate to 1LSB for all versions.
Readback commands allow verification of any on-chip
register in just one 24- or 32- bit instruction cycle. All other
commands produce a “rolling readback” response from
the LTC2704, dramatically reducing the needed number
of instruction cycles.
A Sleep command allows any combination of DACs to be
powered down. There is also a reset flag and an offset
adjustment pin for each channel.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. SoftSpan is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
BLOCK DIAGRAM
AGND V+1
32 42
V–
REFM1 REFG1 REF1 REF2 REFG2 REFM2 V+2 1,8,15,22,31,36
44 2 43 24 21 23 25
VOSB 40
27 VOSC
C1B 39
28 C1C
RFBB 37
30 RFBC
DAC B
DAC C
OUTB 38
29 OUTC
AGNDB 41
–1 –1
26 AGNDC
VOSA 4
19 VOSD
C1A 5
RFBA 7
OUTA 6
DAC A
DAC D
18 C1D
16 RFBD
17 OUTD
AGNDA 3
33 34
GND VDD
10 13 11 14 9 35 12
CS/LD SCK SDI CLR LDAC RFLAG SRO
20 AGNDD
2704 BD
LTC2704-16
Integral Nonlinearity (INL)
1.0 V+/V– = ±15V
0.8 VREF = 5V
±10V RANGE
0.6
ALL 4 DACS
0.4 SUPERIMPOSED
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2704 TA01b
2704fd
1
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LTC2704
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage V+1, V+2 to V– ........... –0.3V to 36V
V+1, V+2, REF1, REF2, REFM1, REFM2,
OUTx, RFBx, VOSx to GND, AGND,
AGNDx, C1x, REFG1, REFG2.....................................18V
GND, AGND, AGNDx, C1x, REFG1, REFG2 to V+1,
V+2, V–, REF1, REF2, REFM1, REFM2, OUTx,
RFBx, VOSx ...............................................................18V
OUTA, RFBA, VOSA, OUTB, RFBB, VOSB, REF1,
REFM1 to GND, AGND ............... V– – 0.3V to V+1 + 0.3V
OUTC, RFBC, VOSC, OUTD, RFBD, VOSD, REF2, REFM2
to GND, AGND............................ V– – 0.3V to V+2 + 0.3V
VDD, Digital Inputs/Outputs to GND ............. –0.3V to 7V
Digital Inputs/Outputs to VDD ..................................0.3V
GND, AGNDx, REFG1, REFG2 to AGND..................±0.3V
C1x to AGNDx ........................................................±0.3V
V– to Any Pin ...........................................................0.3V
Maximum Junction Temperature.......................... 150°C
Operating Temperature Range
LTC2704C ................................................ 0°C to 70°C
LTC2704I..............................................– 40°C to 85°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
V– 1
REFG1 2
AGNDA 3
VOSA 4
C1A 5
OUTA 6
RFBA 7
V– 8
LDAC 9
CS/LD 10
SDI 11
SRO 12
SCK 13
CLR 14
V– 15
RFBD 16
OUTD 17
C1D 18
VOSD 19
AGNDD 20
REFG2 21
V– 22
TOP VIEW
44 REFM1
43 REF1
42 V+1
41 AGNDB
40 VOSB
39 C1B
38 OUTB
37 RFBB
36 V–
35 RFLAG
34 VDD
33 GND
32 AGND
31 V–
30 RFBC
29 OUTC
28 C1C
27 VOSC
26 AGNDC
25 V+2
24 REF2
23 REFM2
GW PACKAGE
44-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC2704CGW-16#PBF
LTC2704CGW-16#TRPBF LTC2704CGW-16
44-Lead Plastic SSOP
LTC2704IGW-16#PBF
LTC2704IGW-16#TRPBF LTC2704IGW-16
44-Lead Plastic SSOP
LTC2704CGW-14#PBF
LTC2704CGW-14#TRPBF LTC2704CGW-14
44-Lead Plastic SSOP
LTC2704IGW-14#PBF
LTC2704IGW-14#TRPBF LTC2704IGW-14
44-Lead Plastic SSOP
LTC2704CGW-12#PBF
LTC2704CGW-12#TRPBF LTC2704CGW-12
44-Lead Plastic SSOP
LTC2704IGW-12#PBF
LTC2704IGW-12#TRPBF LTC2704IGW-12
44-Lead Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
2704fd
2
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LTC2704
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C, V+1 = V+2 = 15V, V– = –15V, VDD = 5V, REF1 = REF2 = 5V, AGND = AGNDx =
REFG1 = REFG2 = GND = 0V.
SYMBOL PARAMETER
CONDITIONS
LTC2704-12
LTC2704-14
LTC2704-16
MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
Accuracy
Resolution
l 12 14 16
Bits
Monotonicity
l 12 14 16
Bits
INL Integral Nonlinearity VREF = 5V
DNL Differential Nonlinearity VREF = 5V
GE Gain Error
VREF = 5V
Gain Temperature
Coefficient
ΔGain/ΔTemperature
l ±1
l ±1
l ±0.5 ±2
l ±2
±1
±1
±1 ±5
±2
±2
±1
±4 ±20
±2
LSB
LSB
LSB
ppm/°C
VOS
Unipolar Zero-Scale
Span = 0V to 5V, TA = 25°C
Error Span = 0V to 10V, TA = 25°C
Span = 0V to 5V
Span = 0V to 10V
±80 ±200
± 80 ±200
±80 ±200
μV
±100 ±300
±100 ±300
±100 ±300
μV
l ±140 ±400 ±140 ±400 ±140 ±400 μV
l ±150 ±600 ±150 ±600 ±150 ±600 μV
VOS Temperature
Coefficient
0V to 5V Range
0V to 10V Range
l ±2 ±2 ±2 μV/°C
l ±2 ±2 ±2 μV/°C
BZE Bipolar Zero
Error
All Bipolar Ranges
±0.25 ±1
l ±2
±0.5 ±2
±2.5
±2 ±8
±12
LSB
LSB
PSRR
Power Supply
Rejection Ratio
VDD = 5V ±10% (Note 3)
VDD = 3V ±10% (Note 3)
0V to 10V Range, Code = 0
V+/V– = ±15V ±10% (Note 2)
V+/V– = ±5V ±10%, VREF = 2V (Note 2)
l
l
±0.003
±0.006
±0.001 ±0.06
±0.002 ±0.05
±0.013
±0.025
±0.005 ±0.25
±0.01 ±0.13
±0.05
±0.1
±0.02 ±0.1
±0.04 ±0.5
LSB/V
LSB/V
LSB/V
LSB/V
Analog Outputs (Note 4)
Settling Time
Output Swing
Load Current
Load Regulation
0V to 5V Range, 5V Step, to ±1LSB
0V to 10V or ±5V Range,
10V Step, to ±1LSB
±10V Range, 20V Step, to ±1LSB
V+/V– = ±15V, VREF = ±7.25V,
0V to 10V Range, ILOAD = ±3mA (Note 2)
V+/V– = ±5V, VREF = ±2.25V,
0V to 10V Range, ILOAD = ±2.5mA (Note 2)
V+/V– = ±10.8V to ±16.5V, VREF = ±5V,
0V to 10V Range, VOUT = ±10V (Note 2)
V+/V– = ±4.5V to ±16.5V, VREF = ±2V,
0V to 10V Range, VOUT = ±4V (Note 2)
V+/V– = ±15V, VREF = 5V,
0V to 10V Range, Code = 0, ±5mA Load
(Note 2)
V+/V– = ±5V, VREF = 2V,
0V to 10V Range, Code = 0, ±3mA Load
(Note 2)
l –14.3
l –4.5
l
l
l
l
3
5
8
3.5 4
5.5
9
14.3 –14.3
6
10
14.3 –14.3
14.3
μs
μs
μs
V
4.5 –4.5
4.5 –4.5
4.5
V
±5
±4
±3
±2.7
±0.005
±5
±4
±3
±2.7
±0.01
±5
±4
±3
±2.7
±0.04
mA
mA
mA
mA
LSB/mA
±0.01
±0.013
±0.05 LSB/mA
Output
Impedance
ISC Short-Circuit
Current
VREF = 5V, 0V to 10V Range,
Code = 0, ±5mA Load
V+CC/Vood–dee===±01F,u6Vl.l5OSVU,cTValSReEh,FoV=rOteU5dTV,tSo±h1Vo0+rVt(eNdRoattonegV2e–)
V+/V– = ±5.5V, VREF = 2V, ±10V Range
Code = 0, VOUT Shorted to V+ (Note 2)
Code = Full Scale, VOUT Shorted to V–
l
l
l –36
l
l –36
0.015
38
–36
38
–36
0.006
0.006
Ω
38
–36
38
–36
38 mA
mA
38 mA
mA
2704fd
3
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