19-6249; Rev 0; 3/12
8-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
General Description
The MAX1302 multirange, low-power, 16-bit, succes-
sive-approximation, analog-to-digital converter (ADC)
operates from a single +5V supply and achieves
throughput rates up to 115ksps. A separate digital sup-
ply allows digital interfacing with a 2.7V to 5.25V system
using the SPI-/QSPI™-/MICROWIRE
®
-compatible serial
interface. Partial power-down mode reduces the supply
current to 1.3mA (typ). Full power-down mode reduces
the power-supply current to 1µA (typ).
The MAX1302 provides eight (single-ended) or four
(true differential) analog input channels. Each analog
input channel is independently software programmable
for seven single-ended input ranges (0V to +V
REF
/2,
-V
REF
/2 to 0V, 0V to +V
REF
, -V
REF
to 0V, ±V
REF
/4,
±V
REF
/2, and ±V
REF
), and three differential input
ranges (±V
REF
/2, ±V
REF
, ±2 x V
REF
).
An on-chip +4.096V reference offers a small convenient
ADC solution. The MAX1302 also accepts an external
reference voltage between 3.800V and 4.136V.
The MAX1302 is available in a 24-pin TSSOP package
and is specified for operation from -40°C to +85°C.
Features
o
Software-Programmable Input Range for Each
Channel
o
Single-Ended Input Ranges
0V to +V
REF
/2, -V
REF
/2 to 0V, 0V to +V
REF
,
-V
REF
to 0V, ±V
REF
/4, ±V
REF
/2, and ±V
REF
o
Differential Input Ranges
±V
REF
/2, ±V
REF
, and ±2 x V
REF
o
Eight Single-Ended or Four Differential Analog
Inputs (MAX1302)
o
±6V Overvoltage Tolerant Inputs
o
Internal or External Reference
o
115ksps Maximum Sample Rate
o
Single +5V Power Supply
o
24-Pin TSSOP Package
MAX1302
Ordering Information
PART
MAX1302AEUG+
PIN-PACKAGE
24 TSSOP
CHANNELS
8
Applications
Industrial Control Systems
Data-Acquisition Systems
Avionics
Robotics
MAX1302BEUG+
24 TSSOP
8
Note:
All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
AVDD1 1
CH0 2
CH1 3
CH2 4
CH3 5
CH4 6
CH5 7
CH6 8
CH7 9
CS 10
DIN 11
+
24 AGND1
23 AGND2
22 AVDD2
21 AGND3
MAX1302
20 REF
19 REFCAP
18 DVDD
17 DVDDO
16 DGND
15 DGNDO
14 DOUT
13 SCLK
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
SSTRB 12
TSSOP
________________________________________________________________
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.
8-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
MAX1302
ABSOLUTE MAXIMUM RATINGS
AVDD1 to AGND1 ....................................................-0.3V to +6V
AVDD2 to AGND2 ....................................................-0.3V to +6V
DVDD to DGND ........................................................-0.3V to +6V
DVDDO to DGNDO ..................................................-0.3V to +6V
DVDD to DVDDO......................................................-0.3V to +6V
DVDD, DVDDO to AVDD1 ........................................-0.3V to +6V
AVDD1, DVDD, DVDDO to AVDD2 ..........................-0.3V to +6V
DGND, DGNDO, AGND3, AGND2 to AGND1 ......-0.3V to +0.3V
CS,
SCLK, DIN, DOUT, SSTRB to
DGNDO............................................-0.3V to (V
DVDDO
+ 0.3V)
CH0–CH7 to AGND1 ...................................................-6V to +6V
REF, REFCAP to AGND1 ......................-0.3V to (V
AVDD1
+ 0.3V)
Continuous Current (any pin) ...........................................±50mA
Continuous Power Dissipation (Multilayer board, T
A
= +70°C)
24-Pin TSSOP (derate 13.9mW/°C above +70°C).....1111.1mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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
(V
AVDD1
= V
AVDD2
= V
DVDD
= V
DVDDO
= 5V, V
AGND1
= V
DGND
= V
DGNDO
= V
AGND2
= V
AGND3
= 0V, f
CLK
= 3.5MHz (50% duty
cycle), external clock mode, V
REF
= 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input
range (±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC ACCURACY (Notes 1, 2)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Transition Noise
INL
DNL
MAX1302A
MAX1302B
No missing codes
External or internal reference
Single-ended inputs
Offset Error
Differential inputs
(Note 3)
Channel-to-Channel Gain
Matching
Channel-to-Channel Offset Error
Matching
Offset Temperature Coefficient
Unipolar or bipolar
Unipolar or bipolar
Unipolar
Bipolar
Fully differential
Unipolar
Gain Error
Bipolar
Fully differential
Gain Temperature Coefficient
Unipolar
Bipolar
1.5
1.0
Unipolar
Bipolar
Bipolar
-1
1
0
-1.0
-2.0
0.025
1.0
3
1
2
±0.5
±0.8
±1
ppm/°C
%FSR
µV/°C
±7.5
±7.5
±10
%FSR
mV
mV
16
±1.0
±1.0
±2
±4
+2
Bits
LSB
LSB
LSB
RMS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC SPECIFICATIONS f
IN(SINE-WAVE)
= 5kHz, V
IN
= FSR - 0.05dB, f
SAMPLE
= 130ksps (Notes 1, 2)
Differential inputs, FSR = 2 x V
REF
90
Signal-to-Noise Plus Distortion
SINAD
Single-ended inputs, FSR = V
REF
Single-ended inputs, FSR = V
REF
/2
Single-ended inputs, FSR = V
REF
/4
80
88
85
82
dB
2
_______________________________________________________________________________________
8-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD1
= V
AVDD2
= V
DVDD
= V
DVDDO
= 5V, V
AGND1
= V
DGND
= V
DGNDO
= V
AGND2
= V
AGND3
= 0V, f
CLK
= 3.5MHz (50% duty
cycle), external clock mode, V
REF
= 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input
range (±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Differential inputs, FSR = 2 x V
REF
Signal-to-Noise Ratio
SNR
Single-ended inputs, FSR = V
REF
Single-ended inputs, FSR = V
REF
/2
Single-ended inputs, FSR = V
REF
/4
Total Harmonic Distortion
(Up to the 5th Harmonic)
Spurious-Free Dynamic Range
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation
CONVERSION RATE
External clock mode, Figure 2
Byte-Wide Throughput Rate
f
SAMPLE
External acquisition mode, Figure 3
Internal clock mode, Figure 4
ANALOG INPUTS (CH0–CH7 MAX1302, AGND1)
Small-Signal Bandwidth
Full-Power Bandwidth
All input ranges, V
IN
= 100mV
P-P
(Note 2)
All input ranges, V
IN
= 4V
P-P
(Note 2)
R[2:1] = 001
R[2:1] = 010
R[2:1] = 011
Input Voltage Range (Table 6)
V
CH_
R[2:1] = 100
R[2:1] = 101
R[2:1] = 110
R[2:1] = 111
True-Differential Analog Common-
Mode Voltage Range
Common-Mode Rejection Ratio
Input Current
Input Capacitance
Input Resistance
V
CMDR
CMRR
I
CH_
C
CH_
R
CH_
DIF/SGL = 1 (Note 4)
DIF/S
GL
= 1, input voltage range = ±V
REF
/4
-V
REF
< V
CH_
< +V
REF
-1500
5
6
-V
REF
/4
-V
REF
/2
0
-V
REF
/2
-V
REF
0
-V
REF
-4.75
75
+650
1.5
700
+V
REF
/4
0
+V
REF
/2
+V
REF
/2
0
+V
REF
+V
REF
+5.50
V
dB
µA
pF
kΩ
V
MHz
kHz
114
84
106
ksps
THD
SFDR
t
AD
t
AJ
Figure 21
Figure 21
90
MIN
TYP
90
88
85
82
-98
99
15
100
105
dB
dB
ns
ps
dB
dB
MAX
UNITS
MAX1302
_______________________________________________________________________________________
3
8-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
MAX1302
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD1
= V
AVDD2
= V
DVDD
= V
DVDDO
= 5V, V
AGND1
= V
DGND
= V
DGNDO
= V
AGND2
= V
AGND3
= 0V, f
CLK
= 3.5MHz (50% duty
cycle), external clock mode, V
REF
= 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input
range (±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Reference Output Voltage
Reference Temperature
Coefficient
Reference Short-Circuit Current
Reference Load Regulation
EXTERNAL REFERENCE (REFCAP = AVDD)
Reference Input Voltage Range
REFCAP Buffer Disable
Threshold
V
REF
V
RCTH
(Note 5)
V
REF
= +4.096V, external clock mode,
external acquisition mode, internal clock
mode, or partial power-down mode
V
REF
= +4.096V, full power-down mode
External clock mode, external acquisition
mode, internal clock mode, or partial
power-down mode
Full power-down mode
DIGITAL INPUTS (DIN, SCLK,
CS)
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS (DOUT, SSTRB)
Output Low Voltage
Output High Voltage
DOUT Three-State Leakage
Analog Supply Voltage
Digital Supply Voltage
V
OL
V
OH
I
DDO
V
AVDD1
V
DVDD
V
DVDDO
= 4.75V, I
SINK
= 10mA
V
DVDDO
= 2.7V, I
SINK
= 5mA
I
SOURCE
= 0.5mA
CS
= DVDDO
V
DVDDO
- 0.4
-10
4.75
4.75
+10
5.25
5.25
0.4
0.4
V
V
µA
V
V
V
IH
V
IL
V
HYST
I
IN
C
IN
V
IN
= 0V to V
DVDDO
-10
10
0.2
+10
0.7 x
V
DVDDO
0.3 x
V
DVDDO
V
V
V
µA
pF
20
3.800
V
AVDD1
- 0.4
90
±0.1
45
40
4.136
V
AVDD1
- 0.1
200
±10
kΩ
MΩ
V
V
SYMBOL
V
REF
TC
REF
I
REFSC
REF shorted to AGND1
REF shorted to AVDD
I
REF
= 0 to 0.5mA
CONDITIONS
MIN
4.056
TYP
4.096
±30
10
-1
0.1
10
MAX
4.136
UNITS
V
ppm/°C
mA
mV
INTERNAL REFERENCE (Bypass REFCAP with 0.1µF to AGND1 and REF with 1.0µF to AGND1)
Reference Input Current
I
REF
µA
Reference Input Resistance
R
REF
POWER REQUIREMENTS (AVDD1 and AGND1, AVDD2 and AGND2, DVDD and DGND, DVDDO and DGNDO)
4
_______________________________________________________________________________________
8-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD1
= V
AVDD2
= V
DVDD
= V
DVDDO
= 5V, V
AGND1
= V
DGND
= V
DGNDO
= V
AGND2
= V
AGND3
= 0V, f
CLK
= 3.5MHz (50% duty
cycle), external clock mode, V
REF
= 4.096V (external reference operation), REFCAP = AVDD1, maximum single-ended bipolar input
range (±V
REF
), C
DOUT
= 50pF, C
SSTRB
= 50pF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Preamplifier Supply Voltage
Digital I/O Supply Voltage
SYMBOL
V
AVDD2
V
DVDDO
External clock mode, Internal reference
external acquisition
mode, or internal
External reference
clock mode
External clock mode, external acquisition
mode, or internal clock mode
External clock mode, external acquisition
mode, or internal clock mode
External clock mode, external acquisition
mode, or internal clock mode
Partial power-down mode
Full power-down mode
PSRR
All analog input ranges
External clock mode
SCLK Period
t
CP
External acquisition mode
Internal clock mode
External clock mode
SCLK High Pulse Width (Note 6)
t
CH
External acquisition mode
Internal clock mode
External clock mode
SCLK Low Pulse Width (Note 6)
DIN to SCLK Setup
DIN to SCLK Hold
SCLK Fall to DOUT Valid
CS
Fall to DOUT Enable
t
CL
t
DS
t
DH
t
DO
t
DV
External acquisition mode
Internal clock mode
0.272
0.228
0.1
109
92
40
109
92
40
40
0
40
40
ns
ns
ns
ns
ns
ns
CONDITIONS
MIN
4.75
2.70
3
2.5
0.9
12
0.2
1.3
2
±0.5
62
62
µs
TYP
MAX
5.25
5.25
3.5
mA
3
2
20
1
mA
mA
mA
mA
µA
LSB
UNITS
V
V
MAX1302
AVDD1 Supply Current
I
AVDD1
DVDD Supply Current
AVDD2 Supply Current
DVDDO Supply Current
Total Supply Current
Power-Supply Rejection Ratio
I
DVDD
I
AVDD2
I
DVDDO
TIMING CHARACTERISTICS (Figures 15 and 16)
_______________________________________________________________________________________
5
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