_______________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.
_______________________Applications
Cellular Telephones
Portable Radios
Battery-Powered Systems
Burst-Mode Data Acquisition
Digital Signal Processing
Telecommunications
High-Speed Servo Loops
___________________________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
______________Ordering Information
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
MAX152
+3V, 8-Bit ADC with 1µA Power-Down
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
VDD
VSS
PWRDN
D7 (MSB)
D6
D5
D4
CS
VREF+
VREF-
VIN
D0 (LSB)
D1
D2
D3
WR/RDY
MODE
RD
INT
GND
DIP/SO/SSOP
MAX152
__________________Pin Configuration
TOP VIEW
THREE-
STATE
DRIVERS
4-BIT
DAC
4-BIT
FLASH
ADC
4-BIT
FLASH
ADC
(4LSB)
D0-D7
DATA
OUT
PINS
2-5,
14-17
VREF+
VREF-
VIN
12
11
1
PWRDN
18
20
VDD
10
WR/RDY
CS
GND
7
6
13
8
9
19
RD
INT
VSS
MODE
MAX152
TIMING AND CONTROL CIRCUITRY
VREF+
16
________________Functional Diagram
Call toll free 1-800-998-8800 for free samples or literature.
PART
TEMP. RANGE
MAX152CPP
0°C to +70°C
MAX152CWP
0°C to +70°C
MAX152CAP
0°C to +70°C
MAX152C/D
0°C to +70°C
MAX152EPP
-40°C to +85°C
MAX152EWP
-40°C to +85°C
MAX152EAP
-40°C to +85°C
MAX152MJP
-55°C to +125°C
PIN-PACKAGE
20 Wide SO
20 SSOP
Dice*
20 Plastic DIP
20 Wide SO
20 SSOP
20 CERDIP**
20 Plastic DIP
19-0119; Rev. 1; 12/93
Evaluation Kit Manual
Follows Data Sheet
MAX152
+3V, 8-Bit ADC with 1µA Power-Down
2
_______________________________________________________________________________________
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
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.)
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.
PARAMETER
SYMBOL
CONDITIONS
UNITS
Resolution
N
Bits
Total Unadjusted Error
TUE
Unipolar range
LSB
Differential Nonlinearity
DNL
No-missing-codes guaranteed
LSB
Zero-Code Error (Note 2)
Unipolar and bipolar modes
LSB
Full-Scale Error (Note 2)
Unipolar and bipolar modes
LSB
S/(N+D)
MAX152C/E, f
SAMPLE
=
400kHz, f
IN
= 30.273kHz
dB
THD
dB
Spurious-Free Dynamic Range
dB
Input Full-Power Bandwidth
V
IN
= 3.0V
p-p
MHz
Maximum Input Slew Rate, Tracking
V/µs
Input Voltage Range
V
IN
V
Input Leakage Current
I
IN
V
SS
< V
IN
< V
DD
µA
Input Capacitance
C
IN
pF
Reference Resistance
RREF
k
VREF+ Input Voltage Range
V
VREF- Input Voltage Range
V
Signal-to-Noise Plus
Distortion Ratio
Total Harmonic Distortion
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
ABSOLUTE MAXIMUM RATINGS
MAX152C/E, f
SAMPLE
=
400kHz, f
IN
= 30.273kHz
MAX152M, f
SAMPLE
= 340kHz,
f
IN
= 30.725kHz
MIN
TYP
MAX
8
±1
±1
±1
±1
-50
-50
50
50
0.3
0.28
0.5
VREF-
VREF+
±3
22
1
2
4
VREF- V
DD
V
SS
VREF+
45
45
DYNAMIC PERFORMANCE
(Note 3)
ACCURACY
(Note 1)
ANALOG INPUT
REFERENCE INPUT
MAX152
+3V, 8-Bit ADC with 1µA Power-Down
_______________________________________________________________________________________
3
PARAMETER
CONDITIONS
UNITS
CS, WR, RD, PWRDN
2.0
Input High Voltage
V
INH
MODE
2.4
V
CS, WR, RD, PWRDN
0.66
Input Low Voltage
V
INL
MODE
0.8
V
CS, RD, PWRDN
±1
WR
±3
Input High Current
I
INH
MODE
15
100
µA
Input Low Current
I
INL
CS, WR, RD, PWRDN, MODE
±1
µA
Input Capacitance (Note 4)
C
IN
CS, WR, RD, PWRDN, MODE
5
8
pF
INT, D0-D7, I
SINK
= 20µA
0.1
INT, D0-D7, I
SINK
= 400µA
0.4
Output Low Voltage
V
OL
RDY, I
SINK
= 1mA
0.4
V
INT, D0-D7, I
SOURCE
= 20µA
V
DD
-0.1
Output High Voltage
V
OH
INT, D0-D7, I
SOURCE
= 400µA
V
DD
-0.4
V
Floating-State Current
I
LKG
D0-D7, RDY
±3
µA
Floating Capacitance (Note 4)
C
OUT
D0-D7, RDY
5
8
pF
2.5
5
V
SS
Unipolar operation
GND
V
Positive Supply Voltage
V
DD
3.0
3.6
V
V
DD
= 3.6V
2.5
6
1.5
3
Positive Supply Current
I
DD
V
DD
= 3.0V
1.5
3.5
mA
CS = RD = V
DD
,
PWRDN = 0
µA
Negative Supply Current
I
SS
CS = RD = 0, PWRDN = V
DD
1
50
µA
Power-Down V
SS
Current
CS = RD = V
DD
,
PWRDN = 0
1
25
µA
Power-Supply Rejection
PSR
V
DD
= 3.3V ±10%
±1/16
±1/4
LSB
MAX152E/M,
CS = RD = 0,
PWRDN = V
DD
MAX152C,
CS = RD = 0,
PWRDN = V
DD
MAX152E/M,
CS = RD = 0,
PWRDN = V
DD
Negative Supply Voltage
Bipolar operation (Note 2)
-3.6
-3.0
Power-Down V
DD
Current
(Note 5)
MAX152C,
CS = RD = 0,
PWRDN = V
DD
SYMBOL
MIN
TYP
MAX
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
.
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.)
1
50
MAX152C/E/M
LOGIC INPUTS
LOGIC OUTPUTS
POWER REQUIREMENTS
_________________________________________________________________________________________
MAX152
+3V, 8-Bit ADC with 1µA Power-Down
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MAX152C/E
T
A
= T
MIN
to T
MAX
MIN
MAX
MAX152M
T
A
= T
MIN
to T
MAX
MIN
MAX
UNITS
WR Pulse Width
t
WR
0.6
10
0.66
10
0.8
10
µs
Delay Time Between
WR and RD Pulses
t
RD
0.8
0.9
1.0
µs
RD Pulse Width
t
READ1
400
500
600
ns
t
ACC1
400
500
600
ns
RD to INT Delay
t
RI
300
340
400
ns
t
CWR
t
RD
< t
INTL
,
C
L
= 100pF
1.8
2.06
2.4
µs
Conversion Time
(RD Mode)
t
CRD
2.0
2.3
2.6
µs
Power-Up Time
t
UP
0.9
1.2
1.4
µs
CS to RD,WR
Setup Time
t
CSS
0
0
0
ns
CS to RD,WR
Hold Time
t
CSH
0
0
0
ns
CS to RDY
Delay
t
RDY
C
L
= 50pF,
R
L
= 5.1k
to V
DD
100
120
140
ns
WR to INT Delay
t
INTL
C
L
= 50pF
0.7
1.45
1.6
1.8
RD Pulse Width
t
READ2
WR-RD mode,
t
RD
> t
INTL
,
determined by t
ACC2
(Figure 5)
180
220
250
ns
Data Access Time
(Note 7)
t
ACC2
180
220
250
ns
WR to INT Delay
t
IHWR
180
200
240
ns
Data Access Time
After
INT (Note 7)
t
ID
Stand-alone mode,
C
L
= 100pF
100
130
150
ns
Data Access Time
(RD Mode) (Note 7)
t
ACC0
C
L
= 100pF
t
CRD
+100
t
CRD
+150
ns
RD to INT Delay
(RD Mode)
t
INTH
C
L
= 50pF
100
160
170
180
ns
Data Hold Time
(Note 8)
t
DH
100
130
150
ns
t
P
450
600
700
ns
ALL GRADES
T
A
= +25°C
MIN
TYP
MAX
Conversion Time
(WR-RD Mode)
Delay Time Between
Conversions
Data Access Time
(Note 7)
WR-RD mode,
determined by t
ACC1
(Figure 6)
WR-RD mode,
t
RD
< t
INTL
, C
L
= 100pF
(Figure 6)
WR-RD mode,
t
RD
< t
INTL
, C
L
= 100pF
(Figure 5)
t
CRD
+130
µs
TIMING CHARACTERISTICS
(Unipolar input range, V
DD
= 3V, V
SS
= 0V, T
A
= +25°C, unless otherwise noted.) (Note 6)
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.
Stand-alone mode,
C
L
= 50pF
MAX152
+3V, 8-Bit ADC with 1µA Power-Down
_________________________________________________________________________________________________
5
1.6
0.4
-60
140
CONVERSION TIME
vs. AMBIENT TEMPERATURE
0.6
1.4
TEMPERATURE (°C)
t CRD
(NORMALIZED TO VALUE AT +25°C)
60
1.0
0.8
-20
20
100
1.2
V
DD
= 3.3V
V
DD
= 3.6V
V
DD
= 3.0V
1400
800
2.8
4.0
CONVERSION TIME
vs. SUPPLY VOLTAGE
900
1300
SUPPLY VOLTAGE (V)
t CRD
(ns)
3.6
1100
1000
3.0
3.4
3.8
1200
3.2
8.0
4.0
1k
10k
100k
EFFECTIVE BITS vs.
INPUT FREQUENCY, WR-RD MODE
INPUT FREQUENCY (Hz)
EFFECTIVE BITS
1M
7.5
7.0
6.5
6.0
5.5
5.0
4.5
V
DD
= 3.0V
fSAMPLE = 400kHz
VIN = 2.98Vp-p
TA = TMIN to TMAX
0
-120
0
200
SIGNAL-TO-NOISE RATIO
FREQUENCY (kHz)
RATIO (dB)
120
-80
40
80
160
-40
-20
-100
-60
f
IN
= 30.27 kHz
f
SAMPLE
= 400ksps
SNR = 48.2dB
6
1
2.8
3.0
3.4
3.8
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2
5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.2
3.6
4
3
MILITARY
CS = RD = 0V
COMMERCIAL
+25°C
EXTENDED
5
0
120
160
240
320
ERROR
vs. POWER-UP TIME
1
4
MAX186
-
5
tUP (ns)
ERROR (LSBs)
200
280
3
2
VDD = 3.0V
VDD = 3.6V
__________________________________________Typical Operating Characteristics
(T
A
=+25°C, unless otherwise noted).
0.7
2.8
3.8
NORMALIZED TIMING
vs. SUPPLY VOLTAGE
0.8
1.1
SUPPLY VOLTAGE (V)
TIMING (NORMALIZED TO V
DD
= 3.0V)
3.4
1.0
0.9
3.0
3.2
3.6
4.0
10,000
1
1
100k
AVERAGE POWER CONSUMPTION
vs. CONVERSION RATE USING PWRDN
10
1000
CONVERSIONS/SEC
SUPPLY CURRENT (µA)
1k
100
10
100
10k
1M
V
DD
= 3.0V
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