19-0119; Rev. 1; 12/93
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+3V, 8-Bit ADC with 1µA Power-Down
___________________________Features
o
Single +3.0V to +3.6V Supply
o
1.8µs Conversion Time
o
Power-Up in 900ns
o
Internal Track/Hold
o
400ksps Throughput
o
Low Power: 1.5mA (Operating Mode)
1µA
(Power-Down Mode)
o
300kHz Full-Power Bandwidth
o
20-Pin DIP, SO and SSOP Packages
o
No External Clock Required
o
Unipolar/Bipolar Inputs
o
Ratiometric Reference Inputs
o
2.7V Version Available – Contact Factory
_______________General Description
The MAX152 high-speed, microprocessor (µP)-com-
patible, 8-bit analog-to-digital converter (ADC) uses a
half-flash technique to achieve a 1.8µs conversion
time, and digitizes at a rate of 400k samples per sec-
ond (ksps). It operates with single +3V or dual ±3V
supplies and accepts either unipolar or bipolar inputs.
– —— — ——
— — —
–
A P O W E R D O W N pin reduces current consumption to
a typical value of 1µA. The part returns from power-
down and acquires an input signal in less than 900ns,
providing large reductions in supply current in applica-
tions with burst-mode input signals.
The MAX152 is DC and dynamically tested. Its µP inter-
face appears as a memory location or input/output port that
requires no external interface logic. The data outputs use
latched, three-state buffered circuitry for direct connection
to a µP data bus or system input port. The ADC's input/ref-
erence arrangement enables ratiometric operation. A fully-
assembled evaluation kit provides a proven PC board lay-
out to speed prototyping and design.
MAX152
______________Ordering Information
PART
MAX152CPP
MAX152CWP
MAX152CAP
MAX152C/D
MAX152EPP
MAX152EWP
MAX152EAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 Wide SO
20 SSOP
Dice*
20 Plastic DIP
20 Wide SO
20 SSOP
_______________________Applications
Cellular Telephones
Portable Radios
Battery-Powered Systems
Burst-Mode Data Acquisition
Digital Signal Processing
Telecommunications
High-Speed Servo Loops
20 CERDIP**
MAX152MJP
-55°C to +125°C
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
________________Functional Diagram
VDD
12
VREF+
11
VREF-
VIN 1
20
18
4-BIT
FLASH
ADC
__________________Pin Configuration
TOP VIEW
VIN
PWRDN
1
2
3
4
5
6
7
8
9
20
19
18
17
VDD
VSS
PWRDN
D7 (MSB)
D6
D5
D4
CS
VREF+
VREF-
D0 (LSB)
D1
THREE-
STATE
DRIVERS
D0-D7
DATA
OUT
PINS
2-5,
14-17
D2
D3
WR/RDY
MODE
RD
INT
4-BIT
DAC
VREF+
16 4-BIT
FLASH
ADC
(4LSB)
TIMING AND CONTROL CIRCUITRY
6
7
10
13
8
GND MODE
WR/RDY
CS
RD
MAX152
16
15
14
13
12
11
MAX152
GND
10
19
9
INT
VSS
DIP/SO/SSOP
1
________________________________________________________________
Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
+3V, 8-Bit ADC with 1µA Power-Down
MAX152
ABSOLUTE MAXIMUM RATINGS
VDD to GND .............................................................-0.3V to +7V
VSS to GND ..............................................................+0.3V to -7V
Digital Input Voltage to GND ........................-0.3V, (VDD + 0.3V)
Digital Output Voltage to GND .....................-0.3V, (VDD + 0.3V)
VREF+ to GND................................(VSS - 0.3V) to (VDD + 0.3V)
VREF- to GND.................................(VSS - 0.3V) to (VDD + 0.3V)
VIN to GND .....................................(VSS - 0.3V) to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) ..........889mW
Wide SO (derate 10.00mW/°C above +70°C)..............800mW
SSOP (derate 8.00mW/°C above +70°C) ....................640mW
CERDIP (derate 11.11mW/°C above +70°C) ...............889mW
Operating Temperature Ranges:
MAX152C__ ........................................................0°C to +70°C
MAX152E__ .....................................................-40°C to +85°C
MAX152MJP ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°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
(Unipolar input range, V
DD
= 3.0V to 3.6V, GND = 0V, V
SS
= GND, VREF+ = 3.0V, VREF- = GND, specifications are given for RD
mode (pin 7 = GND), T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
ACCURACY
(Note 1)
Resolution
Total Unadjusted Error
Differential Nonlinearity
Zero-Code Error (Note 2)
Full-Scale Error (Note 2)
DYNAMIC PERFORMANCE
(Note 3)
Signal-to-Noise Plus
Distortion Ratio
MAX152C/E, f
SAMPLE
=
400kHz, f
IN
= 30.273kHz
MAX152M, f
SAMPLE
= 340kHz,
f
IN
= 30.725kHz
MAX152C/E, f
SAMPLE
=
400kHz, f
IN
= 30.273kHz
MAX152M, f
SAMPLE
= 340kHz,
f
IN
= 30.725kHz
MAX152C/E, f
SAMPLE
=
400kHz, f
IN
= 30.273kHz
MAX152M, f
SAMPLE
= 340kHz,
f
IN
= 30.725kHz
V
IN
= 3.0V
p-p
0.28
V
IN
I
IN
C
IN
RREF
1
VREF-
V
SS
V
SS
< V
IN
< V
DD
22
2
4
V
DD
VREF+
VREF-
50
dB
50
0.3
0.5
VREF+
±3
MHz
V/µs
V
µA
pF
kΩ
V
V
45
dB
45
-50
dB
-50
N
TUE
DNL
Unipolar range
No-missing-codes guaranteed
Unipolar and bipolar modes
Unipolar and bipolar modes
8
±1
±1
±1
±1
Bits
LSB
LSB
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
S/(N+D)
Total Harmonic Distortion
THD
Spurious-Free Dynamic Range
Input Full-Power Bandwidth
Maximum Input Slew Rate, Tracking
ANALOG INPUT
Input Voltage Range
Input Leakage Current
Input Capacitance
REFERENCE INPUT
Reference Resistance
VREF+ Input Voltage Range
VREF- Input Voltage Range
2
_______________________________________________________________________________________
+3V, 8-Bit ADC with 1µA Power-Down
ELECTRICAL CHARACTERISTICS (continued)
(Unipolar input range, V
DD
= 3.0V to 3.6V, GND = 0V, V
SS
= GND, VREF+ = 3.0V, VREF- = GND, specifications are given for RD
mode (pin 7 = GND), T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
LOGIC INPUTS
Input High Voltage
Input Low Voltage
V
INH
V
INL
CS, WR, RD, PWRDN
MODE
CS, WR, RD, PWRDN
MODE
CS, RD, PWRDN
Input High Current
Input Low Current
Input Capacitance (Note 4)
LOGIC OUTPUTS
INT,
D0-D7, I
SINK
= 20µA
Output Low Voltage
V
OL
INT,
D0-D7, I
SINK
= 400µA
RDY, I
SINK
= 1mA
Output High Voltage
Floating-State Current
Floating Capacitance (Note 4)
POWER REQUIREMENTS
Positive Supply Voltage
Negative Supply Voltage
V
DD
V
SS
Unipolar operation
Bipolar operation (Note 2)
MAX152C,
CS
=
RD
= 0,
PWRDN
= V
DD
MAX152E/M,
CS
=
RD
= 0,
PWRDN
= V
DD
MAX152C,
CS
=
RD
= 0,
PWRDN
= V
DD
MAX152E/M,
CS
=
RD
= 0,
PWRDN
= V
DD
MAX152C/E/M
-3.6
2.5
2.5
1.5
1.5
1
1
1
±1/16
3.0
GND
-3.0
5
6
mA
3
3.5
50
50
25
±1/4
µA
µA
µA
LSB
3.6
V
V
V
OH
I
LKG
C
OUT
INT,
D0-D7, I
SOURCE
= 20µA
INT,
D0-D7, I
SOURCE
= 400µA
D0-D7, RDY
D0-D7, RDY
5
V
DD
-0.1
V
DD
-0.4
±3
8
0.1
0.4
0.4
V
µA
pF
V
I
INH
I
INL
C
IN
WR
MODE
CS, WR, RD, PWRDN,
MODE
CS, WR, RD, PWRDN,
MODE
5
15
2.0
2.4
0.66
0.8
±1
±3
100
±1
8
µA
pF
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX152
V
DD
= 3.6V
Positive Supply Current
I
DD
V
DD
= 3.0V
Power-Down V
DD
Current
(Note 5)
Negative Supply Current
Power-Down V
SS
Current
Power-Supply Rejection
PSR
I
SS
CS
=
RD
= V
DD
,
PWRDN
= 0
CS
=
RD
= 0,
PWRDN
= V
DD
CS
=
RD
= V
DD
,
PWRDN
= 0
V
DD
= 3.3V ±10%
Note 1:
Accuracy measurements performed at V
DD
= 3.0V, unipolar mode. Operation over supply range is guaranteed by power-
supply rejection test.
Note 2:
Bipolar tests are performed with VREF+ = +1.5V, VREF- = -1.5V, V
SS
= -3.0V.
Note 3:
Unipolar input range, V
IN
= 3.0V
P-P
, WR-RD mode, V
DD
= 3.0V
Note 4:
Guaranteed by design.
Note 5:
Power-down current increases if control inputs are not driven to ground or V
DD
.
_______________________________________________________________________________________
3
+3V, 8-Bit ADC with 1µA Power-Down
MAX152
TIMING CHARACTERISTICS
(Unipolar input range, V
DD
= 3V, V
SS
= 0V, T
A
= +25°C, unless otherwise noted.) (Note 6)
PARAMETER
Conversion Time
(WR-RD Mode)
Conversion Time
(RD Mode)
Power-Up Time
CS
to
RD,WR
Setup Time
CS
to
RD,WR
Hold Time
CS
to RDY
Delay
Data Access Time
(RD Mode) (Note 7)
RD
to
INT
Delay
(RD Mode)
Data Hold Time
(Note 8)
Delay Time Between
Conversions
WR
Pulse Width
Delay Time Between
WR
and
RD
Pulses
RD
Pulse Width
Data Access Time
(Note 7)
RD
to
INT
Delay
WR
to
INT
Delay
RD
Pulse Width
SYMBOL
t
CWR
t
CRD
t
UP
t
CSS
t
CSH
t
RDY
t
ACC0
t
INTH
t
DH
t
P
t
WR
t
RD
t
READ1
WR-RD mode,
determined by t
ACC1
(Figure 6)
WR-RD mode,
t
RD
< t
INTL
, C
L
= 100pF
(Figure 6)
C
L
= 50pF
WR-RD mode,
t
RD
> t
INTL
,
determined by t
ACC2
(Figure 5)
WR-RD mode,
t
RD
< t
INTL
, C
L
= 100pF
(Figure 5)
Stand-alone mode,
C
L
= 50pF
Stand-alone mode,
C
L
= 100pF
180
0.7
450
0.6
0.8
400
10
C
L
= 50pF,
R
L
= 5.1kΩ to V
DD
C
L
= 100pF
C
L
= 50pF
100
0
0
100
t
CRD
+100
160
100
600
0.66
0.9
500
10
CONDITIONS
t
RD
< t
INTL
,
C
L
= 100pF
ALL GRADES
T
A
= +25°C
MIN
TYP
MAX
1.8
2.0
0.9
0
0
120
t
CRD
+130
170
130
700
0.8
1.0
600
10
MAX152C/E
T
A
= T
MIN
to T
MAX
MIN
MAX
2.06
2.3
1.2
0
0
140
t
CRD
+150
180
150
MAX152M
T
A
= T
MIN
to T
MAX
MIN
MAX
2.4
2.6
1.4
UNITS
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
µs
µs
ns
t
ACC1
t
RI
t
INTL
t
READ2
400
300
1.45
220
500
340
1.6
250
600
400
1.8
ns
ns
µs
ns
Data Access Time
(Note 7)
WR
to
INT
Delay
Data Access Time
After
INT
(Note 7)
t
ACC2
t
IHWR
t
ID
180
180
100
220
200
130
250
240
150
ns
ns
ns
Note 6:
Input control signals are specified with tr = tf = 5ns, 10% to 90% of +3.0V, and timed from a voltage level of 1.3V. Timing
delays get shorter at higher supply voltages. See the Converson Time vs. Supply Voltage graph in the
Typical Operating
Characteristics
to extrapolate timing delays at other power-supply voltages.
Note 7:
See Figure 1 for load circuit. Parameter defined as the time required for the output to cross 0.66V or 2.0V.
Note 8:
See Figure 2 for load circuit. Parameter defined as the time required for the data lines to change 0.5V.
4 _________________________________________________________________________________________
_______________________________________________________________________________________
+3V, 8-Bit ADC with 1µA Power-Down
__________________________________________Typical Operating Characteristics
(T
A
=+25°C, unless otherwise noted).
CONVERSION TIME
vs. AMBIENT TEMPERATURE
tCRD (NORMALIZED TO VALUE AT +25°C)
1.6
1.4
1.2
V
DD
= 3.6V
1.0
0.8
-80
0.6
0.4
-60
-20
20
60
100
140
TEMPERATURE (°C)
V
DD
= 3.0V
-100
-120
0
40
80
120
160
200
FREQUENCY (kHz)
V
DD
= 3.3V
0
-20
RATIO (dB)
-40
-60
f
IN
= 30.27 kHz
f
SAMPLE
= 400ksps
SNR = 48.2dB
EFFECTIVE BITS
MAX152
SIGNAL-TO-NOISE RATIO
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
1k
EFFECTIVE BITS vs.
INPUT FREQUENCY, WR-RD MODE
V
DD
= 3.0V
fSAMPLE = 400kHz
VIN = 2.98Vp-p
TA = TMIN to TMAX
10k
100k
1M
INPUT FREQUENCY (Hz)
CONVERSION TIME
vs. SUPPLY VOLTAGE
TIMING (NORMALIZED TO V
DD
= 3.0V)
1400
1300
1200
tCRD (ns)
1100
1000
900
800
2.8
3.0
3.2
3.4
3.6
3.8
4.0
SUPPLY VOLTAGE (V)
1.1
NORMALIZED TIMING
vs. SUPPLY VOLTAGE
10,000
AVERAGE POWER CONSUMPTION
vs. CONVERSION RATE USING PWRDN
V
DD
= 3.0V
SUPPLY CURRENT (µA)
1000
1.0
0.9
0.8
100
10
0.7
1
2.8
3.0
3.2
3.4
3.6
3.8
4.0
1
10
100
1k
10k
100k
1M
SUPPLY VOLTAGE (V)
CONVERSIONS/SEC
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
6
CS
=
RD
= 0V
SUPPLY CURRENT (mA)
5
MILITARY
EXTENDED
ERROR (LSBs)
4
5
ERROR
vs. POWER-UP TIME
MAX186-5
VDD = 3.0V
4
3
3
COMMERCIAL
2
+25°C
1
2.8
3.0
3.2
3.4
3.6
3.8
SUPPLY VOLTAGE (V)
2
1
VDD = 3.6V
0
120
160
200
240
280
320
tUP (ns)
_________________________________________________________________________________________________
5
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