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PDF LTC2632 Data sheet ( Hoja de datos )
| Número de pieza | LTC2632 | |
| Descripción | Dual 12-/10-/8-Bit SPI Vout DACs | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
n Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2632-L)
4.096V Full-Scale 10ppm/°C (LTC2632-H)
n Maximum INL Error: ±1LSB (LTC2632A-12)
n Low Noise: 0.75mVP-P 0.1Hz to 200kHz
n Guaranteed Monotonic –40°C to 125°C Automotive
Temperature Range
n Selectable Internal or External Reference
n 2.7V to 5.5V Supply Range (LTC2632-L)
n Low Power Operation 0.4mA at 3V
n Power-On-Reset to Zero-Scale/Mid-Scale
n Double-Buffered Data Latches
n 8-Lead ThinSOT™ Package
APPLICATIONS
n Mobile Communications
n Process Control and Industrial Automation
n Automatic Test Equipment
n Portable Equipment
n Automotive
LTC2632
Dual 12-/10-/8-Bit SPI
VOUT DACs with
10ppm/°C Reference
DESCRIPTION
The LTC®2632 is a family of dual 12-, 10-, and 8-bit voltage-
output DACs with an integrated, high-accuracy, low-drift
reference in an 8-lead TSOT-23 package. It has rail-to-rail
output buffers and is guaranteed monotonic.
The LTC2632-L has a full-scale output of 2.5V, and operates
from a single 2.7V to 5.5V supply. The LTC2632-H has a
full-scale output of 4.096V, and operates from a 4.5V to
5.5V supply. Each DAC can also operate with an external
reference, which sets the full-scale output to the external
reference voltage.
These DACs communicate via a simple SPI/MICROWIRE
compatible 3-wire serial interface which operates at clock
rates up to 50MHz. The LTC2632 incorporates a power-on
reset circuit. Options are available for reset to zero-scale
or reset to mid-scale in internal reference mode, or reset
to mid-scale in external reference mode after power-up.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5396245, 5859606, 6891433, and 6937178.
BLOCK DIAGRAM
GND
VCC
VOUTA
DAC A
INTERNAL
REFERENCE
SWITCH
VREF
REF
DAC B
VOUTB
CS/LD
SCK
CONTROL
LOGIC
DECODE
32-BIT SHIFT REGISTER
SDI
POWER-ON
RESET
2632 BD
Integral Nonlinearity (LTC2632A-LZ12)
2 VCC = 3V
INTERNAL REF.
1
0
–1
–2
0
1024
2048
CODE
3072
4095
2632 TA01
2632fa
1
1 page  
LTC2632
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VOUT unloaded unless otherwise specified.
LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (VFS = 2.5V)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Reference Input
Input Voltage Range
Resistance
l1
VCC
l 120 160 200
V
kΩ
Capacitance
12 pF
IREF Reference Current, Power-Down Mode DAC Powered Down
l
0.005
5.0
µA
Reference Output
Output Voltage
l 1.24 1.25 1.26
V
Reference Temperature Coefficient
±10 ppm/°C
Output Impedance
0.5 kΩ
Capacitive Load Driving
10 µF
Short-Circuit Current
Digital I/O
VCC = 5.5V, REF Shorted to GND
2.5 mA
VIH Digital Input High Voltage
VIL Digital Input Low Voltage
ILK Digital Input Leakage
CIN Digital Input Capacitance
AC Performance
VCC = 3.6V to 5.5V
VCC = 2.7V to 3.6V
VCC = 4.5V to 5.5V
VCC = 2.7V to 4.5V
VIN = GND to VCC
(Note 8)
l 2.4
l 2.0
l
l
l
l
V
V
0.8 V
0.6 V
±1 µA
8 pF
tS Settling Time
VCC = 3V (Note 9)
±0.39% (±1LSB at 8 Bits)
±0.098% (±1LSB at 10 Bits)
±0.024% (±1LSB at 12 Bits)
3.5 µs
3.9 µs
4.4 µs
Voltage Output Slew Rate
1.0 V/µs
Capacitive Load Driving
500 pF
Glitch Impulse
At Mid-Scale Transition
2.8 nV•s
DAC-to-DAC Crosstalk
1 DAC Held at FS, 1 DAC Switch 0 to FS
4.5 nV•s
Multiplying Bandwidth
External Reference
320 kHz
en Output Voltage Noise Density
At f = 1kHz, External Reference
At f = 10kHz, External Reference
At f = 1kHz, Internal Reference
At f = 10kHz, Internal Reference
180 nV/√Hz
160 nV/√Hz
200 nV/√Hz
180 nV/√Hz
Output Voltage Noise
0.1Hz to 10Hz, External Reference
0.1Hz to 10Hz, Internal Reference
0.1Hz to 200kHz, External Reference
0.1Hz to 200kHz, Internal Reference
CREF = 0.1µF
30 µVP-P
35 µVP-P
680
730
µµVVPP--PP
2632fa
5
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted. LTC2632-H12 (Internal Reference, VFS = 4.096V)
Integral Nonlinearity (INL)
1.0
VCC = 5V
0.5
Differential Nonlinearity (DNL)
1.0
VCC = 5V
0.5
LTC2632
00
–0.5 –0.5
–1.0
0
1024
2048
CODE
3072
4095
2632 G08
–1.0
0
INL vs Temperature
1.0
VCC = 5V
0.5 INL (POS)
0
INL (NEG)
–0.5
DNL vs Temperature
1.0
VCC = 5V
0.5
DNL (POS)
0
DNL (NEG)
–0.5
1024
2048
CODE
3072
4095
2632 G09
Reference Output Voltage
vs Temperature
2.068
VCC = 5V
2.058
2.048
2.038
–1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2632 G10
–1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2632 G11
2.028
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2632 G12
Settling to ±1LSB Rising
CS/LD
5V/DIV
VOUT
1LSB/DIV
1/4 SCALE TO
3/4 SCALE STEP
VCC = 3V,
VFS = 4.095V
RL = 2k,
CL = 100pF
AVERAGE OF
256 EVENTS
4.1µs
2µs/DIV
2632 G13
Settling to ±1LSB Falling
VOUT
1LSB/DIV
3/4 SCALE TO
1/4 SCALE STEP
VCC = 5V,
VFS = 4.095V
RL = 2k,
CL = 100pF
AVERAGE OF
256 EVENTS
4.9µs
CS/LD
5V/DIV
2µs/DIV
2632 G14
2632fa
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2632.PDF ] | |
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