19-3151; Rev 1; 7/04
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
General Description
The MAX1338 14-bit, analog-to-digital converter (ADC)
offers four simultaneously sampled, fully differential input
channels, with independent track-and-hold (T/H) circuitry
for each channel. The input channels are individually
software programmable for input ranges of ±10V, ±5V,
±2.5V, and ±1.25V. The input channels feature fault tol-
erance to ±17V. The internal T/H circuits have a 16ns
aperture delay and 100ps aperture-delay matching.
A 14-bit parallel bus provides the conversion result with
a maximum per-channel output rate of 150ksps
(600ksps for all four channels). The MAX1338 has an
on-board oscillator and 2.5V internal reference. An
external clock and/or reference can also be used.
The MAX1338 operates from a +5V supply for analog
inputs and digital core. The device operates from a +2.7V
to +5.25V supply for the digital I/O lines. The MAX1338
features two power-saving modes: standby mode and
shutdown mode. Standby mode allows rapid wake-up
and reduces quiescent current to 4mA (typ), and shut-
down mode reduces sleep current to less than 10µA (typ).
The MAX1338 is available in an 8mm x 8mm x 0.8mm,
56-pin, thin QFN package. The device operates over
the extended -40°C to +85°C temperature range.
♦
150ksps Sample Rate per Channel
♦
All Four Input Channels Simultaneously Sampled
16ns Aperture Delay
100ps Aperture-Delay Matching
♦
Channel-Independent Software-Selectable Input
Range: ±10V, ±5V, ±2.5V, ±1.25V
♦
±17V Fault-Tolerant Inputs
♦
Dynamic Performance at 10kHz Input
SNR: 77dB
SINAD: 76dB
SFDR: 98dBc
THD: -83dBc
♦
DC Performance
INL: ±2 LSB
DNL: ±1 LSB
Offset Error: ±4 LSB
Gain Error: ±0.1% FSR
♦
14-Bit Parallel Interface
♦
Internal Clock and Reference Voltage
♦
+5V Analog and Digital Supplies
♦
+2.7V to +5.25V Digital I/O Supply
♦
56-Pin Thin QFN Package (8mm x 8mm x 0.8mm)
Features
MAX1338
Applications
Multiple-Channel Data Recorders
Vibration Analysis
Motor Control: 3-Phase Voltage, Current, and
Power Measurement
Optical Communication Equipment
Ordering Information
PART
MAX1338ETN
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
56 Thin QFN-EP*
*EP
= Exposed pad.
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
MAX1338
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND .........................................................-0.3V to +6V
DV
DD
to DGND.........................................................-0.3V to +6V
DRV
DD
to DRGND ....................................................-0.3V to +6V
AV
DD
to DV
DD
.......................................................-0.3V to +0.3V
DGND to DRGND ..................................................-0.3V to +0.3V
AGND to DGND.....................................................-0.3V to +0.3V
AGND to DRGND ..................................................-0.3V to +0.3V
AIN0+, AIN0-, AIN1+, AIN1-, AIN2+, AIN2-, AIN3+,
AIN3- to AGND .....................................................-17V to +17V
D0–D13 to DRGND................................-0.3V to (DRV
DD
+ 0.3V)
REFADC, REFP1, REFP2, REFN1, REFN2, COM1, COM2 to
AGND....................................................-0.3V to (AV
DD
+ 0.3V)
INTCLK/EXTCLK
to AGND.......................-0.3V to (AV
DD
+ 0.3V)
CS, RD, WR,
CONVST, to DRGND........-0.3V to (DRV
DD
+ 0.3V)
SHDN, STANDBY, CLK,
EOC,
EOLC
to DRGND ................................-0.3V to (DRV
DD
+ 0.3V)
Maximum Current into Any Pin .........................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
56-Pin Thin QFN (derate 31.3mW /°C above +70°C)....2500mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Junction to Ambient Thermal Resistance
θ
JA
..................32°C/W
Junction to Case Thermal Resistance
θ
JC
.........................2°C/W
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
= +5.0V, DRV
DD
= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f
CLK
= 5MHz, input range =
±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,
0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T
A
= +25°C. T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
STATIC PERFORMANCE
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Offset-Error Temperature
Coefficient
Offset-Error Matching
Gain Error
Channel Gain-Error Matching
Gain-Error Temperature
Coefficient
Sampling Rate Per Channel
Signal-to-Noise Ratio
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
Spurious-Free Dynamic Range
Channel-to-Channel Isolation
ANALOG INPUTS (AIN_)
Range set bits = (0,0)
Input Differential Voltage Range
Range set bits = (0,1)
Range set bits = (1,0)
Range set bits = (1,1)
-10
-5
-2.5
-1.25
+10
+5
+2.5
+1.25
V
SNR
SINAD
THD
SFDR
Offset nulled (Notes 1, 2)
Offset nulled
Offset nulled
N
INL
DNL
(Note 1)
No missing codes (Note 1)
(Note 1)
14
±1
±0.25
±4
5
±10
±0.1
±20
10
±0.35
±3
±1
±16
Bits
LSB
LSB
LSB
ppm/°C
LSB
%FSR
LSB
ppm/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC PERFORMANCE (at f
IN
= 10kHz, A
IN
= -0.2dBFS)
Simultaneous on all channels
(Note 1)
(Note 1)
(Note 1)
Range 0 (Note 1)
(Note 1)
85
80
75
74
77
76
-83
-80
150
ksps
dB
dB
dBc
dBc
dB
2
_______________________________________________________________________________________
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +5.0V, DRV
DD
= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f
CLK
= 5MHz, input range =
±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,
0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T
A
= +25°C. T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Range set bits = (0,0)
Input Common-Mode Range
Range set bits = (0,1)
Range set bits = (1,0)
Range set bits = (1,1)
Input Resistance
Input Capacitance
Small-Signal Bandwidth
Full-Power Bandwidth
INTERNAL REFERENCE (REFADC)
Output Voltage
Differential Reference Voltage
Output-Voltage Temperature
Coefficient
Load Regulation
EXTERNAL REFERENCE
REFADC Voltage Input Range
REFADC Input Current
REFADC Input Resistance
REFADC Input Capacitance
TRACK/HOLD (T/H)
Aperture Delay
Aperture-Delay Matching
Aperture Jitter
t
AJ
(Note 1)
0.7 x
AV
DD
0.3 x
AV
DD
0.7 x
DRV
DD
0.3 x
DRV
DD
50
C
IN
15
CLOCK-SELECT INPUT (INTCLK/EXTCLK)
Input-Voltage High
Input-Voltage Low
V
IH
V
IL
V
V
t
AD
(Note 1)
16
100
50
ns
ps
ps
RMS
R
REF
(Note 3)
2.0
-250
5
15
2.5
3.0
+250
V
µA
kΩ
pF
REFP–
REFN
2.475
2.5
2.5
50
5
2.525
V
V
ppm/°C
V/mA
SSBW
FPBW
(Note 1)
(Note 1)
All settings
MIN
-5
-2.5
-1.25
-0.625
6.25
15
1
75
TYP
MAX
+5
+2.5
+1.25
+0.625
kΩ
pF
MHz
kHz
V
UNITS
MAX1338
DIGITAL INTERFACE AND CONTROL INPUTS (CS,
RD, WR,
CONVST, SHDN, CLK, STANDBY)
Input-Voltage High
Input-Voltage Low
Input Hysteresis
Input Capacitance
V
IH
V
IL
V
V
mV
pF
_______________________________________________________________________________________
3
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
MAX1338
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +5.0V, DRV
DD
= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f
CLK
= 5MHz, input range =
±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,
0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T
A
= +25°C. T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Input Current
SYMBOL
I
IN
CONDITIONS
V
IN
= 0 or DRV
DD
DRV
DD
- 0.6
0.4
DRV
DD
-
0.6
0.4
1
RD
= 1 or
CS
= 1
V
IH
V
IL
50
C
IN
I
IN
V
IN
= 0 or DRV
DD
DRV
DD
-
0.6
0.4
1
15
AV
DD
DV
DD
DRV
DD
AI
DD
SHDN = 1
STANDBY = 1, SHDN = 0
Digital Supply Current
DI
DD
SHDN = 1
STANDBY = 1, SHDN = 0
Digital Driver Supply Current
Analog Power-Supply Rejection
DRI
DD
SHDN = 1
STANDBY = 1, SHDN = 0
4.75V to 5.25V (Note 1)
4.75
4.75
2.70
41
Analog Supply Current
0.005
4.2
0.001
0.001
0
0
75
5
5
5.25
5.25
5.25
60
0.1
5
3
0.05
0.05
3
0.05
0.05
dB
mA
mA
mA
15
±1
0.7 x
DRV
DD
0.3 x
DRV
DD
15
MIN
TYP
MAX
±1
UNITS
µA
DIGITAL INTERFACE AND CONTROL OUTPUTS (EOC,
EOLC)
Output-Voltage High
Output-Voltage Low
PARALLEL DIGITAL I/O (D0–D7)
Output-Voltage High
Output-Voltage Low
Leakage Current
Tristate Output Capacitance
Input-Voltage High
Input-Voltage Low
Input Hysteresis
Input Capacitance
Input Current
V
OH
V
OL
Sourcing 0.8mA
Sinking 1.6mA
V
V
µA
pF
V
V
mV
pF
µA
V
OH
V
OL
Sourcing 0.8mA
Sinking 1.6mA
V
V
PARALLEL DIGITAL OUTPUTS (D8–D13)
Output-Voltage High
Output-Voltage Low
Leakage Current
Tristate Output Capacitance
POWER SUPPLIES
Analog Supply Voltage
Digital Supply Voltage
Parallel Digital I/O Supply Voltage
V
V
V
V
OH
V
OL
Sourcing 0.8mA
Sinking 1.6mA
V
V
µA
pF
4
_______________________________________________________________________________________
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +5.0V, DRV
DD
= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f
CLK
= 5MHz, input range =
±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,
0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T
A
= +25°C. T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SYMBOL
Internal clock
Time to First Conversion Result
t
EOC1
External clock
Internal clock
Time to Subsequent Conversions
t
NEXT
External clock
Internal clock
External clock
0.2
0.1
30
30
30
30
0
0
0
0
Figure 1
Figure 1
5
20
20
20
Internal clock
EOC
Pulse-Width Low
Wake-Up Time From Standby
Wake-Up Time From Shutdown
All bypass capacitors discharged
t
EOC
External clock
180
200
1
7
5
30
30
CONDITIONS
MIN
2.9
TYP
3.2
16
600
3
MAX
3.5
UNITS
µs
CLK
Cycles
ns
CLK
Cycles
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLK
Cycle
µs
ns
MAX1338
TIMING CHARACTERISTICS
(Figures 4, 5, and 6)
CONVST Pulse-Width Low
CS
Pulse Width
RD
Pulse-Width Low
RD
Pulse-Width High
WR
Pulse-Width Low
CS
to
WR
Setup Time
WR
to
CS
Hold Time
CS
to
RD
Setup Time
RD
to
CS
Hold Time
Data Access Time
(RD Low to Valid Data)
Bus Relinquish Time
(RD High to D_ High-Z)
CLK Rise to End-of-Conversion
(EOC) Rise/Fall Delay
CLK Rise to End-of-Last-
Conversion (EOLC) Fall Delay
CONVST Rise to
EOLC
Fall Delay
t
CONVST
t
CS
t
RDL
t
RDH
t
WRL
t
CTW
t
WTC
t
CTR
t
RTC
t
ACC
t
REQ
t
EOCD
t
EOLCD
t
CVEOLCD
_______________________________________________________________________________________
5
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