19-1083; Rev 1; 8/96
+5V, 1Msps, 4 & 8-Channel,
8-Bit ADCs with 1µA Power-Down
_______________General Description
The MAX114/MAX118 are microprocessor-compatible,
8-bit, 4-channel and 8-channel analog-to-digital con-
verters (ADCs). They operate from a single +5V supply
and use a half-flash technique to achieve a 660ns con-
version time (1Msps). A power-down (PWRDN) pin
reduces current consumption typically to 1µA. The
devices return from power-down mode to normal oper-
ating mode in less than 200ns, allowing large supply-
current reductions in burst-mode applications (in burst
mode, the ADC wakes up from a low-power state at
specified intervals to sample the analog input signals).
Both converters include a track/hold, enabling the ADC
to digitize fast analog signals.
Microprocessor (µP) interfaces are simplified because the
ADC can appear as a memory location or I/O port without
external interface logic. The data outputs use latched,
three-state buffer circuitry for direct connection to an 8-bit
parallel µP data bus or system input port. The
MAX114/MAX118 input/reference configuration enables
ratiometric operation.
The 4-channel MAX114 is available in a 24-pin DIP or
SSOP. The 8-channel MAX118 is available in a 28-pin
DIP or SSOP. For +3V applications, refer to the
MAX113/MAX117 data sheet.
____________________________Features
o
Single +5V Supply Operation
o
4 (MAX114) or 8 (MAX118) Analog Input Channels
o
Low Power: 40mW (operating mode)
5µW (power-down mode)
o
Total Unadjusted Error
≤1LSB
o
Fast Conversion Time: 660ns per Channel
o
No External Clock Required
o
Internal Track/Hold
o
1MHz Full-Power Bandwidth
o
Internally Connected 8th Channel Monitors
Reference Voltage (MAX118)
MAX114/MAX118
______________Ordering Information
PART
MAX114CNG
MAX114CAG
MAX114C/D
MAX114ENG
MAX114EAG
MAX114MRG
TEMP. RANGE
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
-55°C to +125°C
PIN-PACKAGE
24 Narrow Plastic DIP
24 SSOP
Dice*
24 Narrow Plastic DIP
24 SSOP
24 Narrow CERDIP**
________________________Applications
High-Speed DSP
Portable Equipment
Remote Data Acquisition
Communications Systems
Ordering Information continued on last page.
*Dice are specified at T
A
= +25°C, DC parameters only.
**Contact factory for availability.
Pin Configurations appear on last page.
_________________________________________________________Functional Diagram
REF+
D7
D6
D5
D4
*IN8
*IN7
*IN6
*IN5
IN4
IN3
IN2
IN1
MUX
4-BIT
FLASH
ADC
(4MSBs)
Σ
REF+
16
4-BIT
DAC
THREE-
STATE
OUTPUT
DRIVERS
D3
D2
D1
D0
4-BIT
FLASH
ADC
(4LSBs)
TIMING AND
CONTROL
ADDRESS
LATCH
DECODE
MAX114/MAX118
A0
* MAX118 ONLY
A1
A2
REF-
RD
CS
PWRDN
MODE
WR/RDY
INT
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
+5V, 1Msps, 4 & 8-Channel,
8-Bit ADCs with 1µA Power-Down
MAX114/MAX118
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +7V
Digital Input Voltage to GND ......................-0.3V to (V
DD
+ 0.3V)
Digital Output Voltage to GND ...................-0.3V to (V
DD
+ 0.3V)
REF+ to GND..............................................-0.3V to (V
DD
+ 0.3V)
REF- to GND...............................................-0.3V to (V
DD
+ 0.3V)
IN_ to GND .................................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C)....................................1.08W
24-Pin SSOP (derate 8.00mW/°C above +70°C)..............640mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C).........................................1W
28-Pin Wide Plastic DIP
(derate 14.29mW/°C above +70°C)....................................1.14W
28-Pin SSOP (derate 9.52mW/°C above +70°C)..............762mW
28-Pin Wide CERDIP
(derate 16.67mW/°C above +70°C)....................................1.33W
Operating Temperature Ranges
MAX114/MAX118C_ _...........................................0°C to +70°C
MAX114/MAX118E_ _ ........................................-40°C to +85°C
MAX114/MAX118M_ _ .....................................-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
(V
DD
= +5V ±5%, REF+ = 5V, REF- = GND, Read Mode (MODE = GND), T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
ACCURACY
(Note 1)
Resolution
Total Unadjusted Error
Differential Nonlinearity
Zero-Code Error
Full-Scale Error
Channel-to-Channel Mismatch
DYNAMIC PERFORMANCE
Signal-to-Noise Plus
Distortion Ratio
Total Harmonic Distortion
Spurious-Free Dynamic
Range
Input Full-Power Bandwidth
Input Slew Rate, Tracking
ANALOG INPUT
Input Voltage Range
Input Leakage Current
Input Capacitance
REFERENCE INPUT
Reference Resistance
REF+ Input Voltage Range
REF- Input Voltage Range
R
REF
1
V
REF-
GND
2
4
V
DD
V
REF+
kΩ
V
V
V
IN
_
I
IN
_
C
IN
_
GND < V
IN
_
< V
DD
32
V
REF-
V
REF+
±3
V
µA
pF
SINAD
THD
SFDR
MAX11_C/E, f
SAMPLE
= 1MHz, f
IN
_
= 195.8kHz
MAX11_M, f
SAMPLE
= 740kHz, f
IN
_
= 195.7kHz
MAX11_C/E, f
SAMPLE
= 1MHz, f
IN
_
= 195.8kHz
MAX11_M, f
SAMPLE
= 740kHz, f
IN
_
= 195.7kHz
MAX11_C/E, f
SAMPLE
= 1MHz, f
IN
_
= 195.8kHz
MAX11_M, f
SAMPLE
= 740kHz, f
IN
_
= 195.7kHz
V
IN
_
= 5Vp-p
3.1
50
50
1
15
45
45
-50
-50
dB
dB
dB
MHz
V/µs
N
TUE
DNL
No-missing-codes guaranteed
8
±1
±1
±1
±1
±1/4
Bits
LSB
LSB
LSB
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+5V, 1Msps, 4 & 8-Channel,
8-Bit ADCs with 1µA Power-Down
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, REF+ = 5V, REF- = GND, Read Mode (MODE = 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,
A0, A1, A2
MODE
CS, WR, RD, PWRDN,
A0, A1, A2
MODE
CS, RD, PWRDN,
A0, A1, A2
Input High Current
Input Low Current
Input Capacitance (Note 2)
LOGIC OUTPUTS
Output Low Voltage
Output High Voltage
Three-State Current
Three-State Capacitance
(Note 2)
POWER REQUIREMENTS
Supply Voltage
V
DD
Supply Current
Power-Down V
DD
Current
Power-Supply Rejection
PSR
V
DD
I
DD
CS
=
RD
= 0V,
PWRDN
= V
DD
MAX11_C
MAX11_E/M
4.75
8
8
1
±1/16
5.25
15
20
10
±1/4
V
mA
µA
LSB
V
OL
V
OH
I
LKG
C
OUT
I
SINK
= 1.6mA,
INT,
D0–D7
RDY, I
SINK
= 2.6mA
I
SOURCE
= 360µA,
INT,
D0–D7
D0–D7, RDY, digital outputs = 0V to V
DD
D0–D7, RDY
5
4
±3
8
0.4
0.4
V
V
µA
pF
I
INH
I
INL
C
IN
WR
MODE
CS, WR, RD, PWRDN,
MODE, A0, A1, A2
CS, WR, RD, PWRDN,
MODE, A0, A1, A2
5
50
2.4
3.5
0.8
1.5
±1
±3
200
±1
8
µA
pF
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX114/MAX118
CS
=
RD
= V
DD
,
PWRDN
= 0V (Note 3)
V
DD
= 4.75V to 5.25V, V
REF
= 4.75V
Note 2:
Guaranteed by design.
Note 3:
Power-down current increases if logic inputs are not driven to GND or V
DD
.
_______________________________________________________________________________________
3
+5V, 1Msps, 4 & 8-Channel,
8-Bit ADCs with 1µA Power-Down
MAX114/MAX118
TIMING CHARACTERISTICS
(V
DD
= +4.75V, T
A
= +25°C, unless otherwise noted.) (Note 4)
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)
RD
to
INT
Delay
(RD Mode)
Data Hold Time
Minimum Acquisition
Time
WR
Pulse Width
Delay Between
WR
and
RD
Pulses
RD
Pulse Width
(WR-RD Mode)
Data-Access Time
(WR-RD Mode)
RD
to
INT
Delay
WR
to
INT
Delay
RD
Pulse Width
(WR-RD Mode)
Data-Access Time
(WR-RD Mode)
WR
to
INT
Delay
Data-Access Time
after
INT
Multiplexer Address
Hold Time
Note 4:
Note 5:
Note 6:
Note 7:
SYMBOL
CONDITIONS
t
RD
< t
INTL
,
(Note 5)
C
L
= 20pF
C
L
= 100pF
T
A
= +25°C
ALL GRADES
MIN
t
CWR
t
CRD
t
UP
t
CSS
t
CSH
t
RDY
t
ACC0
t
INTH
t
DH
t
ACQ
t
WR
t
RD
t
READ1
t
ACC1
t
RI
t
INTL
t
READ2
t
ACC2
t
IHWR
t
ID
t
AH
C
L
= 50pF
t
RD
> t
INTL
, determined by
t
ACC2
t
RD
> t
INTL
, C
L
= 100pF
(Note 5)
Pipelined mode, C
L
= 50pF
Pipelined mode, C
L
= 100pF
30
65
90
80
45
35
380
t
RD
< t
INTL
,
determined by t
ACC1
t
RD
< t
INTL
, C
L
= 100pF
(Note 5)
C
L
= 50pF,
R
L
= 5.1kΩ to V
DD
C
L
= 100pF (Note 5)
C
L
= 50pF
(Note 6)
(Note 7)
160
0.25
0.25
160
185
150
500
75
110
100
60
40
10
50
0
0
70
t
CRD
+
50
80
60
185
0.28
0.35
205
235
185
610
85
130
120
70
10
TYP
MAX
660
685
700
320
0
0
85
t
CRD
+
65
85
70
260
0.4
0.45
240
275
220
700
10
T
A
= T
MIN
to T
MAX
MAX11_C/E
MAX11_M
MIN
MAX
MIN
MAX
865
875
370
0
0
100
t
CRD
+
75
90
80
1125
975
520
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
Input control signals are specified with t
r
= t
f
= 5ns, 10% to 90% of 5V, and timed from a voltage level of 1.6V.
See Figure 1 for load circuit. Parameter defined as the time required for the output to cross 0.8V or 2.4V.
See Figure 2 for load circuit. Parameter defined as the time required for the data lines to change 0.5V.
Also defined as the Minimum Address-Valid to Convert-Start Time.
4
_______________________________________________________________________________________
+5V, 1Msps, 4 & 8-Channel,
8-Bit ADCs with 1µA Power-Down
__________________________________________Typical Operating Characteristics
(V
DD
= +5V, T
A
= +25°C, unless otherwise noted.)
CONVERSION TIME
vs. AMBIENT TEMPERATURE
MAX114/118-01
MAX114/MAX118
t
CRD
(NORMALIZED TO VALUE AT V
DD
= +5V, +25°C)
EFFECTIVE NUMBER OF BITS vs.
INPUT FREQUENCY (WR-RD MODE)
MAX114/118-02
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
-60
-20
20
60
100
V
DD
= +5V
V
DD
= +5.25V
V
DD
= +4.75V
8.0
EFFECTIVE NUMBER OF BITS
7.5
7.0
6.5
f
SAMPLE
= 1MHz
V
IN
= 4.96Vp-p
6.0
1k
10k
100k
1M
140
TEMPERATURE (°C)
INPUT FREQUENCY (Hz)
AVERAGE POWER CONSUMPTION
vs. SAMPLING RATE USING PWRDN
MAX114/118-03
SIGNAL-TO-NOISE RATIO
MAX114/118-04
50
0
V
DD
= 4.75V
INPUT FREQUENCY =
195.8ksps
V
IN
= 4.72Vp-p
SAMPLE
FREQUENCY = 1MHz
SNR = 48.2dB
POWER DISSIPATION (mW)
40
-20
RATIO (dB)
30
-40
20
-60
10
0
1k
10k
100k
1M
SAMPLING RATE (CONVERSIONS/SEC)
-80
-100
0
100
200
300
400
500
FREQUENCY (kHz)
TOTAL UNADJUSTED ERROR
vs. POWER-UP TIME
MAX114/118-06
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDING REFERENCE CURRENT)
MAX114/118-08
6
5
4
TUE (LSB)
3
2
1
0
75
100
125
150 175
200
225
12
10
SUPPLY CURRENT (mA)
8
6
4
2
0
250
-60
-20
20
60
100
140
POWER-UP TIME, t
UP
(ns)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
ARM技术
