19-3332; Rev 3; 3/08
KIT
ATION
EVALU
BLE
AVAILA
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
General Description
The MAX1340/MAX1342/MAX1346/MAX1348 integrate a
multichannel, 12-bit, analog-to-digital converter (ADC)
and a quad, 12-bit, digital-to-analog converter (DAC) in a
single IC. The devices also include a temperature sensor
and configurable general-purpose I/O ports (GPIOs) with
a 25MHz SPI™-/QSPI™-/MICROWIRE™-compatible seri-
al interface. The ADC is available in a 4 or an 8 input-
channel version. The four DAC outputs settle within 2.0µs,
and the ADC has a 225ksps conversion rate.
All devices include an internal reference (4.096V) provid-
ing a well-regulated, low-noise reference for both the
ADC and DAC. Programmable reference modes for the
ADC and DAC allow the use of an internal reference, an
external reference, or a combination of both. Features
such as an internal ±1°C accurate temperature sensor,
FIFO, scan modes, programmable internal or external
clock modes, data averaging, and AutoShutdown™ allow
users to minimize both power consumption and proces-
sor requirements. The low glitch energy (4nV
•
s) and low
digital feedthrough (0.5nV
•
s) of the integrated quad
DACs make these devices ideal for digital control of fast-
response closed-loop systems.
The devices are guaranteed to operate with a supply
voltage from +4.75V to +5.25V The devices consume
2.5mA at 225ksps throughput, only 22µA at 1ksps
throughput, and under 0.2µA in the shutdown mode. The
MAX1342/MAX1348 offer four GPIOs that can be config-
ured as inputs or outputs.
The MAX1340/MAX1342/MAX1346/MAX1348 are avail-
able in 36-pin thin QFN packages. All devices are speci-
fied over the -40°C to +85°C temperature range.
Features
♦
12-Bit, 225ksps ADC
Analog Multiplexer with True-Differential
Track/Hold (T/H)
8 Single-Ended Channels or 4 Differential
Channels (Unipolar or Bipolar)
(MAX1340/MAX1342)
4 Single-Ended Channels or 2 Differential
Channels (Unipolar or Bipolar)
(MAX1346/MAX1348)
Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL
♦
12-Bit, Quad, 2µs Settling DAC
Ultra-Low Glitch Energy (4nV
•
s)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: ±0.5 LSB INL
♦
Internal Reference or External Single-Ended/
Differential Reference
Internal Reference Voltage (4.096V)
♦
Internal ±1°C Accurate Temperature Sensor
♦
On-Chip FIFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
♦
On-Chip Channel-Scan Mode and Internal
Data-Averaging Features
♦
Analog Single-Supply Operation
+4.75V to +5.25V
♦
Digital Supply: 2.7V to AV
DD
♦
25MHz, SPI/QSPI/MICROWIRE Serial Interface
♦
AutoShutdown Between Conversions
♦
Low-Power ADC
2.5mA at 225ksps
22µA at 1ksps
0.2µA at Shutdown
♦
Low-Power DAC: 1.5mA
♦
Evaluation Kit Available (Order MAX1258EVKIT)
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
MAX1340/MAX1342/MAX1346/MAX1348
Applications
Closed-Loop Controls for Optical Components
and Base Stations
System Supervision and Control
Data-Acquisition Systems
Ordering Information/Selector Guide
PART
MAX1340BETX
MAX1342BETX
MAX1346BETX
MAX1348BETX
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
REF
ANALOG
RESOLUTION
ADC
DAC
SUPPLY
PIN-PACKAGE VOLTAGE
GPIOs
BITS**
CHANNELS CHANNELS
(V)
VOLTAGE (V)
36 Thin QFN-EP*
36 Thin QFN-EP*
36 Thin QFN-EP*
36 Thin QFN-EP*
4.096
4.096
4.096
4.096
4.75 to 5.25
4.75 to 5.25
4.75 to 5.25
4.75 to 5.25
12
12
12
12
8
8
4
4
4
4
4
4
0
4
0
4
*EP
= Exposed pad.
**Number
of resolution bits refers to both DAC and ADC.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
MAX1340/MAX1342/MAX1346/MAX1348
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND .........................................................-0.3V to +6V
DGND to AGND.....................................................-0.3V to +0.3V
DV
DD
to AV
DD
.......................................................-3.0V to +0.3V
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs to DGND .........................-0.3V to (DV
DD
+ 0.3V)
Analog Inputs, Analog Outputs and REF_
to AGND...............................................-0.3V to (AV
DD
+ 0.3V)
Maximum Current into Any Pin (except AGND, DGND, AV
DD
,
DV
DD
, and OUT_) ...........................................................50mA
Maximum Current into OUT_.............................................100mA
Continuous Power Dissipation (T
A
= +70°C)
36-Pin Thin QFN (6mm x 6mm)
(derate 26.3mW/°C above +70°C) ......................2105.3mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note:
If the package power dissipation is not exceeded, one output at a time may be shorted to AV
DD
, DV
DD
, AGND, or DGND
indefinitely.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(AV
DD
= DV
DD
= 4.75V to 5.25V, external reference V
REF
= 4.096V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at AV
DD
= DV
DD
= 5V, T
A
= +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
DC ACCURACY (Note 1)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Gain Error
Gain Temperature Coefficient
Channel-to-Channel Offset
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, V
IN
= 4.096V
P-P
, 225ksps, f
CLK
= 3.6MHz)
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
(Up to the Fifth Harmonic)
Spurious-Free Dynamic Range
Intermodulation Distortion
Full-Linear Bandwidth
Full-Power Bandwidth
CONVERSION RATE (Note 3)
External reference
Power-Up Time
t
PU
Internal reference (Note 4)
0.8
218
µs
Conversion
Clock
Cycles
SINAD
THD
SFDR
IMD
f
IN1
= 9.9kHz, f
IN2
= 10.2kHz
SINAD > 70dB
-3dB point
70
-76
72
76
100
1
dB
dBc
dBc
dBc
kHz
MHz
(Note 2)
INL
DNL
12
±0.5
±0.5
±0.5
±0.5
±0.8
±0.1
±1.0
±1.0
±4.0
±4.0
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
SYMBOL
CONDITIONS
ADC
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 4.75V to 5.25V, external reference V
REF
= 4.096V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at AV
DD
= DV
DD
= 5V, T
A
= +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
Acquisition Time
Conversion Time
External-Clock Frequency
Duty Cycle
Aperture Delay
Aperture Jitter
ANALOG INPUTS
Input-Voltage Range (Note 6)
Input Leakage Current
Input Capacitance
INTERNAL TEMPERATURE SENSOR
Measurement Error (Notes 5, 7)
Temperature Resolution
INTERNAL REFERENCE
REF1 Output Voltage
REF1 Voltage Temperature
Coefficient
REF1 Output Impedance
REF1 Short-Circuit Current
EXTERNAL REFERENCE
REF1 Input-Voltage Range
REF2 Input-Voltage Range
(Note 4)
REF1 Input Current (Note 9)
REF2 Input Current
V
REF1
REF mode 11 (Note 4)
REF mode 01
REF mode 11
I
REF1
I
REF2
V
REF
= 4.096V, f
SAMPLE
= 225ksps
Acquisition between conversions
V
REF
= 4.096V, f
SAMPLE
= 225ksps
Acquisition between conversions
1
1
0
40
±0.01
40
±0.01
AV
DD
+
0.05
AV
DD
+
0.05
1
80
±1
80
±1
µA
µA
V
V
REF
= 4.096V
TC
REF
(Note 8)
4.066
4.096
±30
6.5
0.63
4.126
V
ppm/°C
kΩ
mA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±0.7
±1.0
1/8
±3.0
°C
°C/LSB
Unipolar
Bipolar
0
-V
REF
/2
±0.01
24
V
REF
V
REF
/2
±1
V
µA
pF
SYMBOL
t
ACQ
t
CONV
f
CLK
(Note 5)
Internally clocked
Externally clocked
Externally clocked conversion (Note 5)
3.6
0.1
40
30
< 50
3.6
60
CONDITIONS
MIN
0.6
5.5
TYP
MAX
UNITS
µs
µs
MHz
%
ns
ps
MAX1340/MAX1342/MAX1346/MAX1348
V
REF2
V
_______________________________________________________________________________________
3
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
MAX1340/MAX1342/MAX1346/MAX1348
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 4.75V to 5.25V, external reference V
REF
= 4.096V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at AV
DD
= DV
DD
= 5V, T
A
= +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
DC ACCURACY (Note 10)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Offset-Error Drift
Gain Error
Gain Temperature Coefficient
DAC OUTPUT
No load
Output-Voltage Range
10kΩ load to either rail
DC Output Impedance
Capacitive Load
Resistive Load to AGND
Wake-Up Time (Note 12)
1kΩ Output Termination
100kΩ Output Termination
DYNAMIC PERFORMANCE (Notes 5, 13)
Output-Voltage Slew Rate
Output-Voltage Settling Time
Digital Feedthrough
Major Code Transition Glitch
Impulse
Output Noise (0.1Hz to 50MHz)
Output Noise (0.1Hz to 500kHz)
DAC-to-DAC Transition
Crosstalk
SR
t
S
Positive and negative
To 1 LSB, 400 - C00 hex (Note 7)
Code 0, all digital inputs from 0 to DV
DD
Between codes 2047 and 2048
From V
REF
Using internal reference
From V
REF
Using internal reference
3
2
0.5
4
660
720
260
320
0.5
5
V/µs
µs
nV
•
s
nV
•
s
µV
P-P
µV
P-P
nV
•
s
R
L
(Note 11)
AV
DD
= 4.75V, V
REF
= 4.096V, gain error
< 2%
From power-down mode, AV
DD
= 5V
From power-down mode, AV
DD
= 2.7V
Programmed in power-down mode
At wake-up or programmed in
power-down mode
500
25
21
1
100
0.1
0.5
1
AV
DD
-
0.1
Ω
nF
Ω
µs
kΩ
kΩ
0.02
AV
DD
-
0.02
V
GE
(Note 8)
INL
DNL
V
OS
Guaranteed monotonic
(Note 8)
±3
±10
±5
±8
±10
12
±0.5
±4
±1.0
±10
Bits
LSB
LSB
mV
ppm of
FS/°C
LSB
ppm of
FS/°C
SYMBOL
CONDITIONS
DAC
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 4.75V to 5.25V, external reference V
REF
= 4.096V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at AV
DD
= DV
DD
= 5V, T
A
= +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
INTERNAL REFERENCE
REF1 Output Voltage
REF1 Temperature Coefficient
REF1 Short-Circuit Current
EXTERNAL-REFERENCE INPUT
REF1 Input-Voltage Range
REF1 Input Impedance
V
REF1
R
REF1
DIGITAL INTERFACE
DIGITAL INPUTS (SCLK, DIN,
CS, CNVST, LDAC)
Input-Voltage High
Input-Voltage Low
Input Leakage Current
Input Capacitance
DIGITAL OUTPUT (DOUT) (Note 14)
Output-Voltage Low
Output-Voltage High
Tri-State Leakage Current
Tri-State Output Capacitance
DIGITAL OUTPUT (EOC) (Note 14)
Output-Voltage Low
Output-Voltage High
Tri-State Leakage Current
Tri-State Output Capacitance
C
OUT
I
SINK
= 2mA
I
SINK
= 4mA
I
SOURCE
= 2mA
I
SINK
= 15mA
I
SOURCE
= 15mA
DV
DD
-
0.8
±10
C
OUT
15
DV
DD
-
0.5
0.8
15
0.4
0.8
DIGITAL OUTPUTS (GPIO_) (Note 14)
GPIOC_ Output-Voltage Low
GPIOC_ Output-Voltage High
GPIOA_ Output-Voltage Low
GPIOA_ Output-Voltage High
Tri-State Leakage Current
Tri-State Output Capacitance
V
V
V
V
µA
pF
V
OL
V
OH
I
SINK
= 2mA
I
SOURCE
= 2mA
DV
DD
-
0.5
±10
0.4
V
V
µA
pF
C
OUT
15
V
OL
V
OH
I
SINK
= 2mA
I
SOURCE
= 2mA
DV
DD
-
0.5
±10
0.4
V
V
µA
pF
V
IH
V
IL
I
L
C
IN
DV
DD
= 2.7V to 5.25V
DV
DD
= 3.6V to 5.25V
DV
DD
= 2.7V to 3.6V
±0.01
15
2.4
0.8
0.6
±10
V
V
µA
pF
REF modes 01, 10, and 11 (Note 4)
0.7
70
100
AV
DD
130
V
kΩ
TC
REF
V
REF
= 4.096V
4.066
4.096
±30
0.63
4.126
V
ppm/°C
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1340/MAX1342/MAX1346/MAX1348
_______________________________________________________________________________________
5
传感器
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