LINER LTC1591-1CG

LTC1591/LTC1597
14-Bit and 16-Bit Parallel
Low Glitch Multiplying DACs
with 4-Quadrant Resistors
DESCRIPTION
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FEATURES
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True 16-Bit Performance Over Industrial
Temperature Range
DNL and INL: 1LSB Max
On-Chip 4-Quadrant Resistors Allow Precise 0V to
10V, 0V to – 10V or ±10V Outputs
Pin Compatible 14- and 16-Bit Parts
Asynchronous Clear Pin
LTC1591/LTC1597: Reset to Zero Scale
LTC1591-1/LTC1597-1: Reset to Midscale
Glitch Impulse < 2nV-s
28-Lead SSOP Package
Low Power Consumption: 10µW Typ
Power-On Reset
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APPLICATIONS
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Process Control and Industrial Automation
Direct Digital Waveform Generation
Software-Controlled Gain Adjustment
Automatic Test Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
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The LTC®1591/LTC1597 are pin compatible, parallel input
14-bit and 16-bit multiplying current output DACs that operate from a single 5V supply. INL and DNL are accurate to 1LSB
over the industrial temperature range in both 2- and 4quadrant multiplying modes. True 16-bit 4-quadrant multiplication is achieved with on-chip 4-quadrant multiplication
resistors.
These DACs include an internal deglitcher circuit that reduces
the glitch impulse to less than 2nV-s (typ). The asynchronous
CLR pin resets the LTC1591/LTC1597 to zero scale and
LTC1591-1/LTC1597-1 to midscale.
The LTC1591/LTC1597 are available in 28-pin SSOP and
PDIP packages and are specified over the industrial temperature range.
For serial interface 16-bit current output DACs refer to the
LTC1595/LTC1596 data sheet.
LTC1591/LTC1591-1 Integral Nonlinearity
TYPICAL APPLICATION
1.0
VREF = 10V
VOUT = ±10V BIPOLAR
INTEGRAL NONLINEARITY (LSB)
0.8
16-Bit, 4-Quadrant Multiplying DAC with a
Minimum of External Components
VREF
+
5V
0.1µF
LT®1468
2
RCOM
R1
R2
LTC1597-1
1
REF
23 4
VCC ROFS
WR
LD
CLR
9
8
28
–0.4
–0.6
ROFS
12288
8192
4096
DIGITAL INPUT CODE
16383
1591/97 TA02
RFB
LTC1597/LTC1597-1 Integral Nonlinearity
15pF
1.0
RFB
–
6
16-BIT DAC
DGND
WR LD CLR
0
–0.2
0
AGND
10 TO 21,
24 TO 27
0.2
5
IOUT1
16
DATA
INPUTS
0.4
–1.0
15pF
3
R1
0.6
–0.8
–
7
+
VREF = 10V
VOUT = ±10V BIPOLAR
0.8
LT1468
VOUT =
–VREF
TO VREF
22
1591/97 TA01
INTEGRAL NONLINEARITY (LSB)
■
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1591/97 TA03
1
LTC1591/LTC1597
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W W
W
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC to AGND ............................................... – 0.5V to 7V
VCC to DGND .............................................. – 0.5V to 7V
AGND to DGND ............................................. VCC + 0.5V
DGND to AGND ............................................. VCC + 0.5V
REF, ROFS, RFB, R1, RCOM to AGND, DGND .......... ±25V
Digital Inputs to DGND ............... – 0.5V to (VCC + 0.5V)
IOUT1 to AGND ............................ – 0.5V to( VCC + 0.5V)
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
LTC1591C/LTC1591-1C
LTC1597C/LTC1597-1C .......................... 0°C to 70°C
LTC1591I/LTC1591-1I
LTC1597I/LTC1597-1I ....................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
REF
1
28 CLR
RCOM
2
27 NC
R1
3
26 NC
ROFS
4
25 D0
RFB
5
24 D1
IOUT1
6
23 VCC
AGND
7
22 DGND
LD
8
21 D2
WR
9
20 D3
D13 10
19 D4
D12 11
REF
1
28 CLR
RCOM
2
27 D0
R1
3
26 D1
ROFS
4
25 D2
RFB
5
24 D3
IOUT1
6
23 VCC
AGND
7
22 DGND
LD
8
21 D4
WR
9
20 D5
D15 10
19 D6
18 D5
D14 11
18 D7
D11 12
17 D6
D13 12
17 D8
D10 13
16 D7
D12 13
16 D9
D9 14
15 D8
D11 14
15 D10
G PACKAGE
28-LEAD PLASTIC SSOP
N PACKAGE
28-LEAD NARROW PDIP
TJMAX = 125°C, θJA = 95°C/ W (G)
TJMAX = 125°C, θJA = 70°C/ W (N)
Consult factory for Military grade parts.
2
LTC1591CG
LTC1591CN
LTC1591IG
LTC1591IN
LTC1591-1CG
LTC1591-1CN
LTC1591-1IG
LTC1591-1IN
G PACKAGE
28-LEAD PLASTIC SSOP
N PACKAGE
28-LEAD NARROW PDIP
TJMAX = 125°C, θJA = 95°C/ W (G)
TJMAX = 125°C, θJA = 70°C/ W (N)
LTC1597ACG
LTC1597ACN
LTC1597BCG
LTC1597BCN
LTC1597-1ACG
LTC1597-1ACN
LTC1597-1BCG
LTC1597-1BCN
LTC1597AIG
LTC1597AIN
LTC1597BIG
LTC1597BIN
LTC1597-1AIG
LTC1597-1AIN
LTC1597-1BIG
LTC1597-1BIN
LTC1591/LTC1597
ELECTRICAL CHARACTERISTICS
VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL PARAMETER
LTC1591/-1
LTC1597B/-1B
MIN TYP MAX MIN TYP MAX
CONDITIONS
LTC1597A/-1A
MIN TYP MAX
UNITS
Accuracy
INL
DNL
GE
Resolution
●
14
16
16
Bits
Monotonicity
●
14
16
16
Bits
Integral Nonlinearity
(Note 2) TA = 25°C
TMIN to TMAX
●
±1
±1
±2
±2
±0.25
±0.35
±1
±1
LSB
LSB
TA = 25°C
TMIN to TMAX
●
±1
±1
±1
±1
±0.2
±0.2
±1
±1
LSB
LSB
Unipolar Mode
(Note 3) TA = 25°C
TMIN to TMAX
●
±4
±6
±16
±24
2
3
±16
±16
LSB
LSB
Bipolar Mode
(Note 3) TA = 25°C
TMIN to TMAX
●
±4
±6
± 16
± 24
2
3
±16
± 16
LSB
LSB
(Note 4) ∆Gain/∆Temperature
●
2
1
2
Differential Nonlinearity
Gain Error
Gain Temperature Coefficient
PSRR
OUT1 Leakage Current
2
1
ppm/°C
TA = 25°C
TMIN to TMAX
●
±3
±5
± 10
± 16
±5
±8
LSB
LSB
(Note 5) TA = 25°C
TMIN to TMAX
●
±5
±15
±5
±15
±5
±15
nA
nA
VCC = 5V ±10
●
±2
LSB/V
Bipolar Zero-Scale Error
ILKG
1
Power Supply Rejection Ratio
±0.1
±1
±0.4
±2
±0.4
VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Input
RREF
DAC Input Resistance (Unipolar)
(Note 6)
●
4.5
6
10
kΩ
R1/R2
R1/R2 Resistance (Bipolar)
(Notes 6, 13)
●
9
12
20
kΩ
ROFS, RFB
Feedback and Offset Resistances
(Note 6)
●
9
12
20
kΩ
AC Performance (Note 4)
THD
Output Current Settling Time
(Notes 7, 8)
1
µs
Midscale Glitch Impulse
(Note 12)
2
nV-s
Digital-to-Analog Glitch Impulse
(Note 9)
1
nV-s
Multiplying Feedthrough Error
VREF = ±10V, 10kHz Sine Wave
1
mVP-P
Total Harmonic Distortion
(Note 10)
108
dB
Output Noise Voltage Density
(Note 11)
10
nV/√Hz
Harmonic Distortion
(Digital Waveform Generation)
Unipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
94
101
94
dB
dB
dB
Bipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
94
101
94
dB
dB
dB
3
LTC1591/LTC1597
ELECTRICAL CHARACTERISTICS
VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
115
70
130
80
pF
pF
Analog Outputs (Note 4)
COUT
Output Capacitance (Note 4)
DAC Register Loaded to All 1s: COUT1
DAC Register Loaded to All 0s: COUT1
●
●
Digital Inputs
VIH
Digital Input High Voltage
●
VIL
Digital Input Low Voltage
●
IIN
Digital Input Current
CIN
Digital Input Capacitance
2.4
0.001
●
(Note 4) VIN = 0V
V
●
0.8
V
±1
µA
8
pF
Timing Characteristics
tDS
Data to WR Setup Time
●
60
20
ns
tDH
Data to WR Hold Time
●
0
–12
ns
tWR
WR Pulse Width
●
60
25
ns
tLD
LD Pulse Width
●
110
55
ns
tCLR
Clear Pulse Width
●
60
40
ns
tLWD
WR to LD Delay Time
●
0
●
4.5
ns
Power Supply
VDD
Supply Voltage
IDD
Supply Current
Digital Inputs = 0V or VCC
The ● denotes specifications that apply over the full operating temperature
range.
Note 1: Absolute Maximum Values are those beyond which the life of a
device may be impaired.
Note 2: ±1LSB = ±0.006% of full scale = ±61ppm of full scale for the
LTC1591/LTC1591-1. ±1LSB = ±0.0015% of full scale = ±15.3ppm of full
scale for the LTC1597/LTC1597-1.
Note 3: Using internal feedback resistor.
Note 4: Guaranteed by design, not subject to test.
Note 5: I(OUT1) with DAC register loaded to all 0s.
Note 6: Typical temperature coefficient is 100ppm/°C.
Note 7: IOUT1 load = 100Ω in parallel with 13pF.
Note 8: To 0.006% for a full-scale change, measured from the rising edge
of LD for the LTC1591/LTC1591-1. To 0.0015% for a full-scale change,
measured from the rising edge of LD for the LTC1597/LTC1597-1.
4
●
5
5.5
V
10
µA
Note 9: VREF = 0V. DAC register contents changed from all 0s to all 1s or
all 1s to all 0s.
Note 10: VREF = 6VRMS at 1kHz. DAC register loaded with all 1s.
Note 11: Calculation from en = √4kTRB where: k = Boltzmann constant
(J/°K), R = resistance (Ω), T = temperature (°K), B = bandwidth (Hz).
Note 12: Midscale transition code: 01 1111 1111 1111 to 10 0000 0000
0000 for the LTC1591/LTC1591-1 and 0111 1111 1111 1111 to 1000
0000 0000 0000 for the LTC1597/LTC1597-1.
Note 13: R1 and R2 are measured between R1 and RCOM, REF and RCOM.
Note 14: Measured using the LT1468 op amp in unipolar mode for I/V
converter and LT1468 I/V and LT1001 reference inverter in bipolar mode.
Sample Rate = 50kHz, Signal Frequency = 1kHz, VREF = 5V, TA = 25°C.
LTC1591/LTC1597
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TYPICAL PERFOR A CE CHARACTERISTICS
Midscale Glitch Impulse
40
Unipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency
Full-Scale Settling Waveform
– 40
SIGNAL/(NOISE + DISTORTION) (dB)
USING AN LT1468
CFEEDBACK = 30pF
VREF = 10V
30
LD PULSE
5V/DIV
20
10
0
GATED
SETTLING
WAVEFORM
500µV/DIV
1nV-s TYPICAL
–10
–20
0.2
0.4
0.8
0.6
TIME (µs)
1.0
– 50
VCC = 5V USING AN LT1468
CFEEDBACK = 30pF
REFERENCE = 6VRMS
– 60
– 70
– 80
500kHz FILTER
– 90
80kHz FILTER
–100
USING LT1468 OP AMP
CFEEDBACK = 20pF
0V to 10V STEP
30kHz FILTER
–110
100
10
1k
10k
FREQUENCY (Hz)
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Zeros
– 40
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Ones
– 40
SIGNAL/(NOISE + DISTORTION) (dB)
VCC = 5V USING TWO LT1468s
CFEEDBACK = 15pF
REFERENCE = 6VRMS
– 50
– 60
– 70
– 80
500kHz FILTER
– 90
–100
30kHz
FILTER
10
100
VCC = 5V USING TWO LT1468s
CFEEDBACK = 15pF
REFERENCE = 6VRMS
– 50
– 60
– 70
– 80
500kHz FILTER
– 90
80kHz FILTER
–100
80kHz FILTER
–110
1k
10k
FREQUENCY (Hz)
30kHz FILTER
–110
100
10
100k
1k
10k
FREQUENCY (Hz)
Supply Current vs Input Voltage
Logic Threshold vs Supply Voltage
3.0
VCC = 5V
ALL DIGITAL INPUTS
TIED TOGETHER
4
2.5
3
2
1
0
100k
1591/97 G05
1591/97 G04
5
100k
1591/97 G03
1591/97 G01
LOGIC THRESHOLD (V)
0
SIGNAL/(NOISE + DISTORTION) (dB)
– 40
1591/97 G02
500ns/DIV
– 30
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (mV)
(LTC1591/LTC1597)
2.0
1.5
1.0
0.5
0
0
1
3
2
INTPUT VOLTAGE (V)
4
5
1591/97 G06
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
7
1591/97 G07
5
LTC1591/LTC1597
U W
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1591)
Differential Nonlinearity (DNL)
1.0
1.0
0.8
0.8
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
INTEGRAL NONLINEARITY (LSB)
1.0
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity (INL)
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
12280
8192
4096
DIGITAL INPUT CODE
16383
0
12280
8192
4096
DIGITAL INPUT CODE
0.2
0
– 0.2
– 0.4
– 0.6
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
16383
1591 G01
Differential Nonlinearity
vs Reference Voltage
in Bipolar Mode
1.0
0.8
0.8
0.8
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
8
DIFFERENTIAL NONLINEARITY (LSB)
1.0
DIFFERENTIAL NONLINEARITY (LSB)
1.0
0.4
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
10
8
1591 G04
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
10
Differential Nonlinearity vs
Supply Voltage in Unipolar Mode
1.0
0.8
0.8
0.2
VREF = 10V
VREF = 2.5V
0
VREF = 10V
VREF = 2.5V
– 0.2
– 0.4
– 0.6
– 0.8
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
VREF = 2.5V
– 0.2
VREF = 10V
– 0.4
– 0.6
– 0.8
–1.0
–1.0
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
6
7
1591 G07
6
DIFFERENTIAL NONLINEARITY (LSB)
1.0
0.8
INTEGRAL NONLINEARITY (LSB)
1.0
0.4
10
1591 G06
Integral Nonlinearity vs
Supply Voltage in Bipolar Mode
0.6
8
1591 G05
Integral Nonlinearity vs
Supply Voltage in Unipolar Mode
10
1591 G03
Differential Nonlinearity
vs Reference Voltage
in Unipolar Mode
0.6
8
1591 G02
Integral Nonlinearity
vs Reference Voltage
in Bipolar Mode
INTEGRAL NONLINEARITY (LSB)
0.6
0.4
– 0.8
–1.0
0
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
VREF = 10V
VREF = 2.5V
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
6
7
1591 G08
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
6
7
1591 G09
LTC1591/LTC1597
U W
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1591)
Differential Nonlinearity vs
Supply Voltage in Bipolar Mode
Unipolar Multiplying Mode Frequency
Response vs Digital Code
0
0.8
– 20
0.6
0.4
0.2
ATTENUATION (dB)
DIFFERENTIAL NONLINEARITY (LSB)
1.0
VREF = 10V
VREF = 2.5V
0
VREF = 10V
VREF = 2.5V
– 0.2
– 0.4
– 0.6
– 40
– 60
– 80
ALL BITS ON
D13 ON
D12 ON
D11 ON
D10 ON
D9 ON
D8 ON
D7 ON
D6 ON
D5 ON
D4 ON
D3 ON
D2 ON
D1 ON
D0 ON
– 100
– 0.8
ALL BITS OFF
–1.0
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
7
6
– 120
100
1k
1M
10k
100k
FREQUENCY (Hz)
1591G11
1591 G10
VREF
30pF
3 2 1 4 5
6
–
LT1468
+
LTC1591
7
22
– 40
– 60
– 80
ALL BITS OFF
D12 ON
D12 AND D11 ON
D12 TO D10 ON
D12 TO D9 ON
D12 TO D8 ON
D12 TO D7 ON
D12 TO D6 ON
D12 TO D5 ON
D12 TO D4 ON
D12 TO D3 ON
D12 TO D2 ON
D12 TO D1 ON
D12 TO D0 ON
D13 ON*
– 20
ATTENUATION (dB)
– 20
ATTENUATION (dB)
0
ALL BITS ON
D13 AND D12 ON
D13 AND D11 ON
D13 AND D10 ON
D13 AND D9 ON
D13 AND D8 ON
D13 AND D7 ON
D13 AND D6 ON
D13 AND D5 ON
D13 AND D4 ON
D13 AND D3 ON
D13 AND D2 ON
D13 AND D1 ON
D13 AND D0 ON
D13 ON*
– 40
– 60
– 80
CODES FROM MIDSCALE TO FULL SCALE
– 100
CODES FROM MIDSCALE TO ZERO SCALE
– 100
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
VOUT
Bipolar Multiplying Mode Frequency
Response vs Digital Code
Bipolar Multiplying Mode Frequency
Response vs Digital Code
0
10M
100
10
100k
1k
10k
FREQUENCY (Hz)
1M
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO – 84dB TYPICAL (–70dB MAX)
VREF
VREF
+
+
LT1468
–
LT1468
–
VOUT
VOUT
12pF
12pF
12pF
12pF
15pF
15pF
3
10M
1591G13
1591 G12
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO – 84dB TYPICAL (–70dB MAX)
10M
2
1 4 5
LTC1591
3
6
7
22
–
LT1468
+
2
1 4 5
LTC1591
6
7
22
–
LT1468
+
7
LTC1591/LTC1597
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Differential Nonlinearity (DNL)
1.0
0.8
0.8
0.8
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
INTEGRAL NONLINEARITY (LSB)
1.0
0.6
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
49152
32768
16384
DIGITAL INPUT CODE
0
65535
49152
32768
16384
DIGITAL INPUT CODE
1597 G01
DIFFERENTIAL NONLINEARITY (LSB)
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
8
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
10
1.5
INTEGRAL NONLINEARITY (LSB)
2.0
0.6
VREF = 10V
VREF = 2.5V
VREF = 10V
– 0.4
– 0.6
– 0.8
7
1597 G07
8
10
1597 G06
1.0
1.0
0.5
VREF = 10V
VREF = 2.5V
0
VREF = 10V
VREF = 2.5V
–1.0
–2.0
–1.0
4
5
6
SUPPLY VOLTAGE (V)
0
– 0.2
Differential Nonlinearity vs
Supply Voltage in Unipolar Mode
–1.5
– 0.8
3
0.2
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
10
– 0.5
VREF = 2.5V
– 0.6
8
8
0.6
Integral Nonlinearity vs
Supply Voltage in Bipolar Mode
0.8
10
0.4
1597 G05
1.0
8
Differential Nonlinearity
vs Reference Voltage
in Bipolar Mode
0.8
Integral Nonlinearity vs
Supply Voltage in Unipolar Mode
2
– 0.6
1.0
1597 G04
– 0.4
– 0.4
1597 G03
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
0.6
– 0.2
– 0.2
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
65535
DIFFERENTIAL NONLINEARITY (LSB)
1.0
0
0
Differential Nonlinearity
vs Reference Voltage
in Unipolar Mode
0.8
0.2
0.2
1597 G02
Integral Nonlinearity
vs Reference Voltage
in Bipolar Mode
0.4
0.6
0.4
– 0.8
–1.0
0
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode
1.0
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity (INL)
(LTC1597)
0.8
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
– 0.2
VREF = 10V
VREF = 2.5V
– 0.4
– 0.6
– 0.8
–1.0
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
1597 G08
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
1597 G09
LTC1591/LTC1597
U W
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1597)
Differential Nonlinearity vs
Supply Voltage in Bipolar Mode
Unipolar Multiplying Mode Frequency
Response vs Digital Code
0
0.8
– 20
0.6
0.4
0.2
ATTENUATION (dB)
DIFFERENTIAL NONLINEARITY (LSB)
1.0
VREF = 10V
0
VREF = 2.5V
– 0.2
VREF = 10V
VREF = 2.5V
– 0.4
– 0.6
– 40
– 60
– 80
– 100
ALL BITS ON
D15 ON
D14 ON
D13 ON
D12 ON
D11 ON
D10 ON
D9 ON
D8 ON
D7 ON
D6 ON
D5 ON
D4 ON
D3 ON
D2 ON
D1 ON
D0 ON
– 0.8
ALL BITS OFF
–1.0
3
2
7
4
5
6
SUPPLY VOLTAGE (V)
– 120
100
10k
100k
FREQUENCY (Hz)
1k
1597G11
1597 G10
VREF
30pF
3 2 1 4 5
6
–
LT1468
+
LTC1597
7
22
Bipolar Multiplying Mode Frequency
Response vs Digital Code
– 20
ATTENUATION (dB)
0
ALL BITS ON
D15 AND D14 ON
D15 AND D13 ON
D15 AND D12 ON
D15 AND D11 ON
D15 AND D10 ON
D15 AND D9 ON
D15 AND D8 ON
D15 AND D7 ON
D15 AND D6 ON
D15 AND D5 ON
D15 AND D4 ON
D15 AND D3 ON
D15 AND D2 ON
– 40
– 60
– 80
10
100
– 40
– 60
D14 TO D5 ON
D14 TO D4 ON
D14 TO D3 ON
D14 TO D2 ON
D14 TO D1 ON
– 80
D15 AND D1 ON
D15 AND D0 ON
D15 ON*
– 100
ALL BITS OFF
D14 ON
D14 AND D13 ON
D14 TO D12 ON
D14 TO D11 ON
D14 TO D10 ON
D14 TO D9 ON
D14 TO D8 ON
D14 TO D7 ON
D14 TO D6 ON
– 20
CODES FROM
MIDSCALE
TO FULL SCALE
1M
10M
CODES FROM
MIDSCALE
TO ZERO SCALE
D14 TO D0 ON
D15 ON*
– 100
1k
10k
100k
FREQUENCY (Hz)
VOUT
Bipolar Multiplying Mode Frequency
Response vs Digital Code
ATTENUATION (dB)
0
10M
1M
10
100
100k
1k
10k
FREQUENCY (Hz)
1M
1597 G12
10M
1597 G13
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO – 96dB TYPICAL (–78dB MAX, A GRADE)
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO – 96dB TYPICAL (–78dB MAX, A GRADE)
VREF
VREF
+
+
LT1468
–
LT1468
–
VOUT
12pF
12pF
VOUT
12pF
12pF
15pF
3
2
1 4 5
LTC1597
6
7
22
–
LT1468
+
15pF
3
2
1 4 5
LTC1597
6
7
22
–
LT1468
+
9
LTC1591/LTC1597
U
U
U
PIN FUNCTIONS
LTC1591
REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.
Typically ±10V, accepts up to ±25V. In 2-Quadrant mode
this is the reference input. In 4-quadrant mode, this pin is
driven by external inverting reference amplifier.
RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant
Resistors R1 and R2. Normally tied to the inverting input
of an external amplifier in 4-quadrant operation, otherwise
shorted to the REF pin. See Figures 1a and 2a.
R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant operation short to the REF pin. In 4-quadrant mode tie to ROFS
(Pin 4).
ROFS (Pin 4): Bipolar Offset Resistor. Typically swings
±10V, accepts up to ±25V. In 2-quadrant operation tie to
RFB. In 4-quadrant operation tie to R1.
IOUT1 (Pin 6): DAC Current Output. Tie to the inverting
input of the current to voltage converter op amp.
AGND (Pin 7): Analog Ground. Tie to ground.
LD (Pin 8): DAC Digital Input Load Control Input. When LD
is taken to a logic high, data is loaded from the input
register into the DAC register, updating the DAC output.
WR (Pin 9):DAC Digital Write Control Input. When WR is
taken to a logic low, data is loaded from the digital input
pins into the 14-bit wide input register.
DB13 to D2 (Pins 10 to 21): Digital Input Data Bits.
DGND (Pin 22): Digital Ground. Tie to ground.
VCC (Pin 23): The Positive Supply Input. 4.5V ≤ VCC ≥ 5.5V.
Requires a bypass capacitor to ground.
DB1, DB0 (Pins 24, 25): Digital Input Data Bits.
RFB (Pin 5): Feedback Resistor. Normally tied to the output
of the current to voltage converter op amp. Swings to
±VREF. VREF is typically ±10V.
NC (Pins 26, 27): No Connect.
LTC1597
IOUT1 (Pin 6): DAC Current Output. Tie to the inverting
input of the current to voltage converter op amp.
REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.
Typically ±10V, accepts up to ±25V. In 2-Quadrant mode
this is the reference input. In 4-quadrant mode, this pin is
driven by external inverting reference amplifier.
RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant
Resistors R1 and R2. Normally tied to the inverting input
of an external amplifier in 4-quadrant operation, otherwise
shorted to the REF pin. See Figures 1b and 2b.
R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant operation short to the REF pin. In 4-quadrant mode tie to ROFS
(Pin 4).
ROFS (Pin 4): Bipolar Offset Resistor. Typically swings
±10V, accepts up to ±25V. In 2-quadrant operation tie to
RFB. In 4-quadrant operation tie to R1.
RFB (Pin 5): Feedback Resistor. Normally tied to the output
of the current to voltage converter op amp. Swings to
±VREF. VREF is typically ±10V.
10
CLR (Pin 28):Digital Clear Control Function for the DAC.
When CLR is taken to a logic low, it sets the DAC output
and all internal registers to zero code for the LTC1591 and
midscale code for the LTC1591-1.
AGND (Pin 7): Analog Ground. Tie to ground.
LD (Pin 8): DAC Digital Input Load Control Input. When LD
is taken to a logic high, data is loaded from the input
register into the DAC register, updating the DAC output.
WR (Pin 9):DAC Digital Write Control Input. When WR is
taken to a logic low, data is loaded from the digital input
pins into the 16-bit wide input register.
DB15 to D4 (Pins 10 to 21): Digital Input Data Bits.
DGND (Pin 22): Digital Ground. Tie to ground.
VCC (Pin 23): The Positive Supply Input. 4.5V ≤ VCC ≥ 5.5V.
Requires a bypass capacitor to ground.
DB3 to DB0 (Pins 24 to 27): Digital Input Data Bits.
CLR (Pin 28):Digital Clear Control Function for the DAC.
When CLR is taken to a logic low, it sets the DAC output
and all internal registers to zero code for the LTC1597 and
midscale code for the LTC1597-1.
LTC1591/LTC1597
TRUTH TABLE
Table 1
CONTROL INPUTS
CLR WR LD
REGISTER OPERATION
0
X
X
Reset Input and DAC Register to All 0s for LTC1591/LTC1597 and Midscale for LTC1591-1/LTC1597-1 (Asynchronous Operation)
1
0
0
Load Input Register with All 14/16 Data Bits
1
1
1
Load DAC Register with the Contents of the Input Register
1
0
1
Input and DAC Register Are Transparent
1
CLK = LD and WR Tied Together. The 14/16 Data Bits Are Loaded into the Input Register on the Falling Edge of the CLK and Then
Loaded into the DAC Register on the Rising Edge of the CLK
1
1
0
No Register Operation
W
BLOCK DIAGRA SM
LTC1591
48k
REF
48k
5 RFB
1
12k
48k
RCOM 2
48k
48k
48k
48k
48k
48k
96k
96k
96k
96k
12k
12k
4 ROFS
12k
R1 3
6 IOUT1
VCC 23
7 AGND
DECODER
LD 8
WR 9
LOAD
22 DGND
D13
(MSB)
D12
D10
D11
D9
•••
DAC REGISTER
D0
(LSB)
INPUT REGISTER
WR
RST
28 CLR
RST
1591 BD
10
11
D13
D12
••••
21
24
25
26
27
D2
D1
D0
NC
NC
11
LTC1591/LTC1597
W
BLOCK DIAGRA SM
LTC1597
48k
REF
48k
5 RFB
1
12k
48k
RCOM 2
48k
48k
48k
48k
48k
48k
96k
96k
96k
96k
12k
12k
4 ROFS
12k
R1 3
6 IOUT1
VCC 23
7 AGND
DECODER
LOAD
LD 8
WR 9
22 DGND
D15
(MSB)
D14
D12
D13
D11
•••
DAC REGISTER
D0
(LSB) RST
INPUT REGISTER
WR
28 CLR
RST
1597 BD
10
11
D15
D14
••••
21
24
25
26
27
D4
D3
D2
D1
D0
WU
W
TI I G DIAGRA
tWR
WR
DATA
tDS
tDH
tLWD
LD
tLD
tCLR
CLR
1591/97TD
12
LTC1591/LTC1597
U
U
W
U
APPLICATIONS INFORMATION
Description
Digital Section
The LTC1591/LTC1597 are 14-/16-bit multiplying, current
output DACs with a full parallel 14-/16-bit digital interface.
The devices operate from a single 5V supply and provide
both unipolar 0V to – 10V or 0V to 10V and bipolar ±10V
output ranges from a 10V or –10V reference input. They
have three additional precision resistors on chip for bipolar operation. Refer to the block diagrams regarding the
following description.
The LTC1591/LTC1597 are 14-/16-bit wide full parallel
data bus inputs. The devices are double-buffered with two
14-/16-bit registers. The double-buffered feature permits
the update of several DACs simultaneously. The input
register is loaded directly from a 16-bit microprocessor
bus when the WR pin is brought to a logic low level. The
second register (DAC register) is updated with the data
from the input register when the LD pin is brought to a
logic high level. Updating the DAC register updates the
DAC output with the new data. To make both registers
transparent for flowthrough mode, tie WR low and LD
high. However, this defeats the deglitcher operation and
output glitch impulse may increase. The deglitcher is
activated on the rising edge of the LD pin. The versatility
of the interface also allows the use of the input and DAC
registers in a master slave or edge-triggered configuration. This mode of operation occurs when WR and LD are
tied together. The asynchronous clear pin resets the
LTC1591/LTC1597 to zero scale and the LTC1591-1/
LTC1597-1 to midscale. CLR resets both the input and
DAC registers. These devices also have a power-on reset.
Table 1 shows the truth table for the LTC1591/LT1597.
The 14-/16-bit DACs consist of a precision R-2R ladder for
the 11/13LSBs. The 3MSBs are decoded into seven segments of resistor value R. Each of these segments and the
R-2R ladder carries an equally weighted current of one
eighth of full scale. The feedback resistor RFB and
4-quadrant resistor ROFS have a value of R/4. 4-quadrant
resistors R1 and R2 have a magnitude of R/4. R1 and R2
together with an external op amp (see Figure 2) inverts the
reference input voltage and applies it to the 14-/16-bit DAC
input REF, in 4-quadrant operation. The REF pin presents
a constant input impedance of R/8 in unipolar mode and
R/12 in bipolar mode. The output impedance of the current
output pin IOUT1 varies with DAC input code. The IOUT1
capacitance due to the NMOS current steering switches
also varies with input code from 70pF to 115pF. An added
feature of these devices, especially for waveform generation, is a proprietary deglitcher that reduces glitch energy
to below 2nV-s over the DAC output voltage range.
Unipolar Mode
(2-Quadrant Multiplying, VOUT = 0V to – VREF)
The LTC1591/LTC1597 can be used with a single op amp
to provide 2-quadrant multiplying operation as shown in
Figure 1. With a fixed – 10V reference, the circuits shown
give a precision unipolar 0V to 10V output swing.
5V
0.1µF
VREF
2
3
R1
RCOM
R1
1
REF
23
VCC
4
5
ROFS
RFB
ROFS
R2
33pF
RFB
IOUT1
14
DATA
INPUTS
LTC1591
14-BIT DAC
10 TO 21,
24, 25
DGND
WR LD CLR
WR
LD
CLR
9
8
28
–
6
AGND
NC
26
NC
22
Unipolar Binary Code Table
7
+
LT1001
VOUT =
0V TO
–VREF
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
LSB
MSB
1111
1000
0000
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
0000
1111
0000
0000
0000
11
00
01
00
27
–VREF (16,383/16,384)
–VREF (8,192/16,384) = –VREF/ 2
–VREF (1/16,384)
0V
1591/97 F01a
Figure 1a. Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to – VREF
13
LTC1591/LTC1597
U
U
W
U
APPLICATIONS INFORMATION
5V
0.1µF
VREF
2
3
R1
RCOM
R1
R2
1
REF
23
VCC
4
5
ROFS
RFB
ROFS
33pF
RFB
IOUT1
16
DATA
INPUTS
LTC1597
10 TO 21,
24 TO 27
–
6
16-BIT DAC
AGND
DGND
7
22
WR LD CLR
WR
LD
CLR
9
8
Unipolar Binary Code Table
+
LT1001
VOUT =
0V TO
–VREF
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
LSB
MSB
1111
1000
0000
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
0000
1111
0000
0000
0000
1111
0000
0001
0000
28
–VREF (65,535/65,536)
–VREF (32,768/65,536) = –VREF/ 2
–VREF (1/65,536)
0V
1591/97 F01b
Figure 1b. Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to – VREF
Bipolar Mode
(4-Quadrant Multiplying, VOUT = – VREF to VREF)
The LTC1591/LTC1597 contain on chip all the 4-quadrant
resistors necessary for bipolar operation. 4-quadrant
multiplying operation can be achieved with a minimum of
external components, a capacitor and a dual op amp, as
shown in Figure 2. With a fixed 10V reference, the circuit
shown gives a precision bipolar – 10V to 10V output
swing.
Op Amp Selection
Because of the extremely high accuracy of the 14-/16-bit
LTC1591/LTC1597, thought should be given to op amp
selection in order to achieve the exceptional performance
of which the part is capable. Fortunately, the sensitivity of
INL and DNL to op amp offset has been greatly reduced
compared to previous generations of multiplying DACs.
Op amp offset will contribute mostly to output offset and
gain and will have minimal effect on INL and DNL. For the
LTC1597, a 500µV op amp offset will cause about 0.55LSB
INL degradation and 0.15LSB DNL degradation with a 10V
full-scale range. The main effects of op amp offset will be
a degradation of zero-scale error equal to the op amp
14
offset, and a degradation of full-scale error equal to twice
the op amp offset. For the LTC1597, the same 500µV op
amp offset (2mV offset for LTC1591) will cause a 3.3LSB
zero-scale error and a 6.5LSB full-scale error with a 10V
full-scale range.
Op amp input bias current (IBIAS) contributes only a zeroscale error equal to IBIAS(RFB/ROFS) = IBIAS(6k). For a
thorough discussion of 16-bit DAC settling time and op
amp selection, refer to Application Note 74, “Component
and Measurement Advances Ensure 16-Bit DAC Settling
Time.”
Reference Input and Grounding
For optimum performance the reference input of the
LTC1597 should be driven by a source impedance of less
than 1kΩ. However, these DACs have been designed to
minimize source impedance effects. An 8kΩ source impedance degrades both INL and DNL by 0.2LSB.
As with any high resolution converter, clean grounding is
important. A low impedance analog ground plane and star
grounding should be used. AGND must be tied to the star
ground with as low a resistance as possible.
LTC1591/LTC1597
U
U
W
U
APPLICATIONS INFORMATION
VREF
+
5V
0.1µF
1/2 LT1112
–
2
3
R1
1
REF
RCOM
R1
5
23 4
VCC ROFS
RFB
ROFS
R2
IOUT1
14
DATA
INPUTS
1/2 LT1112
AGND
10 TO 21,
24, 25
WR LD CLR
9
WR
LD
CLR
NC
28
8
26
+
7
VOUT =
–VREF
TO VREF
22
DGND
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
–
6
14-BIT DAC
LTC1591-1
Bipolar Offset Binary Code Table
33pF
RFB
NC
LSB
MSB
1111
1000
1000
0111
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
1111
0000
1111
0000
0000
1111
0000
11
01
00
11
00
27
VREF (8,191/8,192)
VREF (1/8,192)
0V
–VREF (1/8,192)
–VREF
1591/97 F02a
Figure 2a. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
VREF
+
5V
0.1µF
1/2 LT1112
–
2
3
R1
1
REF
RCOM
R1
ROFS
R2
5
23 4
VCC ROFS
RFB
IOUT1
16
DATA
INPUTS
LTC1597-1
1/2 LT1112
16-BIT DAC
DGND
WR LD CLR
WR
LD
CLR
9
8
–
6
AGND
10 TO 21,
24 TO 27
Bipolar Offset Binary Code Table
33pF
RFB
22
7
+
VOUT =
–VREF
TO VREF
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
LSB
MSB
1111
1000
1000
0111
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
1111
0000
28
1111
0000
0000
1111
0000
1111
0001
0000
1111
0000
VREF (32,767/32,768)
VREF (1/32,768)
0V
–VREF (1/32,768)
–VREF
1591/97 F02b
Figure 2b. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
15
LTC1591/LTC1597
U
TYPICAL APPLICATIONS
Noninverting Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to VREF
+
5V
0.1µF
1/2 LT1112
–
2
1
RCOM
VREF
REF
5
23 4
VCC ROFS
RFB
33pF
3 R1
R1
R2
ROFS
RFB
IOUT1
16
DATA
INPUTS
LTC1597
16
1/2 LT1112
DGND
WR LD CLR
WR
LD
CLR
16-BIT DAC
AGND
10 TO 21,
24 TO 27
9
8
28
–
6
22
1591/97 F06
7
+
VOUT =
0V TO VREF
LTC1591/LTC1597
U
TYPICAL APPLICATIONS
16-Bit VOUT DAC Programmable Unipolar/Bipolar Configuration
16
15
14
LTC203AC
UNIPOLAR/
BIPOLAR
1
2
3
+
15V
2
–
LT1468
LT1236A-10
4
6
+
5V
0.1µF
–
3
2
R1
RCOM
R1
LT1001
R2
1
23
REF VCC
4
5
ROFS
ROFS
RFB
15pF
RFB
IOUT1
16
DATA
INPUTS
LTC1597
DGND
WR LD CLR
WR
LD
CLR
16-BIT DAC
AGND
10 TO 21,
24 TO 27
9
8
–
6
7
+
LT1468
VOUT
22
1591/97 F04
28
17
LTC1591/LTC1597
U
TYPICAL APPLICATIONS
Digital Waveform Generator
15V
2
LT1236A-10
4
6
+
5V
LT1001
0.1µF
–
FREQUENCY CONTROL
SERIAL
OR BYTE
LOAD
REGISTER
n
PARALLEL
n
DELTA
PHASE
REGISTER
M
n = 24 TO 32 BITS
fO
18
PHASE ACCUMULATOR
n
3
2
R1
RCOM
R1
R2
1
REF
5
23 4
VCC ROFS
ROFS
RFB
15pF
RFB
IOUT1
Σ
n
PHASE
REGISTER
n
SIN ROM
LOOKUP
TABLE
16
DATA
INPUTS
LTC1597
–
6
16-BIT DAC
AGND
7
+
LT1468
LOWPASS
FILTER
fO =
CLOCK
PHASE
TRUNCATION
16 BITS
10 TO 21,
24 TO 27
DGND
WR LD CLR
9
8
28
22
1591/97 F05
(M)(fC)
2n
LTC1591/LTC1597
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.397 – 0.407*
(10.07 – 10.33)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.301 – 0.311
(7.65 – 7.90)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.205 – 0.212**
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
0° – 8°
0.0256
(0.65)
BSC
0.022 – 0.037
(0.55 – 0.95)
0.005 – 0.009
(0.13 – 0.22)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
G28 SSOP 0694
N Package
28-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
1.370*
(34.789)
MAX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.020
(0.508)
MIN
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
8.255
+0.889
–0.381
)
0.125
(3.175)
MIN
0.065
(1.651)
TYP
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
N28 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LTC1591/LTC1597
U
TYPICAL APPLICATION
17-Bit Sign Magnitude DAC with Bipolar Zero Error of 140µV (0.92LSB at 17 Bits) at 25°C
16
15
14
LTC203AC
15V
2
1
LT1236A-10
4
2
3
6
+
5V
0.1µF
–
LT1468
15pF
SIGN
BIT
3
2
R1
RCOM
R1
1
REF
5
23 4
VCC ROFS
R2
ROFS
RFB
20pF
RFB
IOUT1
16
DATA
INPUTS
LTC1597
16-BIT DAC
AGND
10 TO 21,
24 TO 27
DGND
WR LD CLR
WR
LD
CLR
9
8
–
6
7
+
LT1468
VOUT
22
1591/97 F03
28
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Op Amps
LT1001
Precision Operational Amplifier
Low Offset, Low Drift
LT1112
Dual Low Power, Precision Picoamp Input Op Amp
Low Offset, Low Drift
LT1468
90MHz, 22V/µs, 16-Bit Accurate Op Amp
Precise, 1µs Settling to 0.0015%
LTC1595/LTC1596
Serial 16-Bit Current Output DACs
Low Glitch, ±1LSB Maximum INL, DNL
LTC1650
Serial 16-Bit Voltage Output DAC
Low Noise and Glitch Rail-to-Rail VOUT
LTC1658
Serial 14-Bit Voltage Output DAC
Low Power, 8-Lead MSOP Rail-to-Rail VOUT
LTC1418
14-Bit, 200ksps 5V Sampling ADC
16mW Dissipation, Serial and Parallel Outputs
LTC1604
16-Bit, 333ksps Sampling ADC
±2.5V Input, SINAD = 90dB, THD = 100dB
LTC1605
Single 5V, 16-Bit 100ksps ADC
Low Power, ±10V Inputs
Precision Reference
Ultralow Drift, 5ppm/°C, High Accuracy 0.05%
DACs
ADCs
References LT1236
20
Linear Technology Corporation
15917f LT/TP 1298 4K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
 LINEAR TECHNOLOGY CORPORATION 1998