Maxim MAX1205CMH, MAX1205EMH Datasheet
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General Description
The MAX1205 is a 14-bit, monolithic, analog-to-digital
converter (ADC) capable of conversion rates up to
1Msps. This integrated circuit, built on a CMOS process, uses a fully differential, pipelined architecture
with digital error correction and a short self-calibration
procedure that corrects for capacitor and gain mismatches and ensures 14-bit linearity at full sample
rates. An on-chip track/hold (T/H) maintains superb
dynamic performance up to the Nyquist frequency. The
MAX1205 operates from a single +5V supply.
The fully differential inputs allow an input swing of
±V
REF
. The reference is also differential, with the positive reference (RFPF) typically connected to +4.096V
and the negative reference (RFNF) connected to analog ground. Additional sensing pins (RFPS, RFNS) are
provided to compensate for any resistive-divider action
that may occur due to finite internal and external resistances in the reference traces and the on-chip resistance of the reference pins. A single-ended input is
also possible using two operational amplifiers.
The power dissipation is typically 257mW at +5V, at a
sampling rate of 1Msps. The device employs a CMOScompatible, 14-bit parallel, two’s complement output
data format. For higher sampling rates, the MAX1201 is
a 2.2Msps pin-compatible upgrade to the MAX1205.
The MAX1205 is available in an MQFP package, and
operates over the commercial (0°C to +70°C) and the
extended (-40°C to +85°C) temperature ranges.
Applications
Imaging
Communications
Medical
Scanners
Data Acquisition
Features
♦ Monolithic, 14-Bit, 1Msps ADC
♦ +5V Single Supply
♦ SNR of 80dB for f
IN
= 500kHz
♦ SFDR of 87dB for f
IN
= 500kHz
♦ Low Power Dissipation: 257mW
♦ On-Demand Self-Calibration
♦ Differential Nonlinearity Error: ±0.3LSB
♦ Integral Nonlinearity Error: ±1.2LSB
♦ Three-State, Two’s Complement Output Data
MAX1205
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
________________________________________________________________
Maxim Integrated Products
1
OE
DAV
CLK
DV
DD
DGND
DGND
DV
DD
TEST1
TEST2
TEST3
D0
ST_CAL
AGND
AV
DD
AGND
AGND
AV
DD
DOR
D13
D12
D11
D10
1
2
3
4
5
6
7
8
9
10
11
1213141516171819202122
4443424140393837363534
33
32
31
30
29
28
27
26
25
24
23
D9D8D7
D6
DRV
DD
DGND
D5D4D3D2D1
END_CAL
INN
N.C.
N.C.
INP
RFNS
RFNF
RFPS
RFPFCMTEST0
TOP VIEW
MQFP
MAX1205
19-4794; Rev 0; 11/98
PART
MAX1205CMH
MAX1205EMH -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
44 MQFP
44 MQFP
EVALUATION KIT
AVAILABLE
Pin Configuration
Ordering Information
MAX1205
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(AVDD= +5V ±5%, DVDD= DRVDD= +3.3V, V
RFPS
= +4.096V, V
RFNS
= AGND, VCM= +2.048V, VIN= -0.5dBFS, f
CLK
= 2.048MHz,
digital output load ≤ 20pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
AVDDto AGND, DGND..........................................................+7V
DV
DD
to DGND, AGND..........................................................+7V
DRV
DD
to DGND, AGND .......................................................+7V
INP, INN, RFPF, RFPS, RFNF, RFNS,
CLK, CM.................................(AGND - 0.3V) to (AV
DD
+ 0.3V)
Digital Inputs to DGND............................-0.3V to (DV
DD
+ 0.3V)
Digital Output (DAV) to DGND..............-0.3V to (DRV
DD
+ 0.3V)
Other Digital Outputs to DGND.............-0.3V to (DRV
DD
+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
44-Pin MQFP (derate 11.11mW/°C above +70°C)........889mW
Operating Temperature Ranges (T
A
)
MAX1205CMH .....................................................0°C to +70°C
MAX1205EMH ..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
REFERENCE/EXTERNAL
TRANSFER CHARACTERISTICS
DYNAMIC SPECIFICATIONS (Note 6)
ANALOG INPUT
To full-scale step (0.006%)
ns
3
t
AD
Aperture Delay
ns
410
t
OVR
ns
100
t
ACQ
Acquisition Time
Overvoltage Recovery Time
MHz
3.3
Full-Power Bandwidth
MHz
78
Small-Signal Bandwidth
After calibration, guaranteed
f
SAMPLE
=
f
CLK
/
2
LSB
-1 ±0.3 +1
DNLDifferential Nonlinearity
LSB
±1.2
INL
Bits
14
RES
Resolution (no missing codes)
(Note 5)
Integral Nonlinearity
f
SAMPLE
Cycles
4
Conversion Time (Pipeline
Delay/Latency)
Msps
1.024
f
SAMPLE
Maximum Sampling Rate
%FSR
-0.2 ±0.003 +0.2
Offset Error
%FSR
-5 -3.0 +5
Gain Error
µV
RMS
75
Input-Referred Noise
Differential
Single-ended
Per side in track mode
CONDITIONS
±4.096 ±4.5
V
4.096 4.5
V
IN
Input Voltage Range
(Notes 2, 3)
Ω
700 1000
Reference Input Resistance
kΩ
55
R
I
Input Resistance (Note 4)
pF
21
C
I
Input Capacitance (Note 3)
V
4.096 4.5
V
REF
Reference Voltage (Note 3)
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX1205
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(AVDD= +5V ±5%, DVDD= DRVDD= +3.3V, V
RFPS
= +4.096V, V
RFNS
= AGND, VCM= +2.048V, VIN= -0.5dBFS, f
CLK
= 2.048MHz,
digital output load ≤ 20pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
dB
55Gain
55Offset
PSRRPower-Supply Rejection Ratio
sec0.1Warm-Up Time
mW257 377PDSSPower Dissipation
10pF loads on D0–D13 and DAV mA0.1 0.6I(DRVDD)Output Drive Supply Current
V3 DV
DD
DRV
DD
Output Drive Supply Voltage
V4.75 5 5.25AV
DD
Analog Supply Voltage
V3 5.25DV
DD
Digital Supply Voltage
mA0.4 1.2I(DVDD)Digital Supply Current
fIN= 504.5kHz
fIN= 300.5kHz
fIN= 99.5kHz
fIN= 504.5kHz
fIN= 300.5kHz
fIN= 99.5kHz
fIN= 300.5kHz
fIN= 504.5kHz
fIN= 99.5kHz
87
Spurious-Free Dynamic Range
(Note 5)
88SFDR dB
84 91
78
79
dB
-86 -80
THD
Total Harmonic Distortion
(Note 5)
-85
-84
dB
77 82
SINAD
Signal-to-Noise Ratio plus
Distortion (Note 5)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
fIN= 504.5kHz
fIN= 300.5kHz
fIN= 99.5kHz
80
81.5
dB
78 83
SNR
Signal-to-Noise Ratio
(Note 5)
mA51 70I(AVDD)Analog Supply Current
POWER REQUIREMENTS
MAX1205
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
4 _______________________________________________________________________________________
CL= 20pF
CONDITIONS
ns187 244 301t
CH
Clock High Time
ns488t
CLK
ns4 / f
SAMPLE
t
CONV
Conversion Time
Clock Period
ns16 75t
REL
Bus Relinquish Time
ns16 75t
AC
Data Access Time
ns187 244 301t
CL
Clock Low Time
ns70 150t
OD
Output Delay
ns1 / f
CLK
t
DAV
DAV Pulse Width
ns65 145t
S
CLK-to-DAV Rising Edge
UNITSMIN TYP MAXSYMBOLPARAMETER
DIGITAL INPUTS AND OUTPUTS
(AVDD= +5V ±5%, DVDD= DRVDD= +3.3V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
I
SOURCE
= 200µA
V
IN_
= 0 or DV
DD
CONDITIONS
4Input Capacitance
DV
DD
- 0.8
V
IH
0.8V
IL
Input Low Voltage
Input High Voltage
DV
DD
DV
DD
- 0.4 - 0.03
V
OH
Output High Voltage
0.8CLK
VIL
CLK Input Low Voltage
AV
DD
- 0.8
CLK
VIH
CLK Input High Voltage
9C
CLK
CLK Input Capacitance
±0.1 ±10I
IN_
Digital Input Current
MIN TYP MAX
SYMBOLPARAMETER
-10 ±1 +10I
CLK
Clock Input Current
±0.1 ±10I
LEAKAGE
Three-State Leakage Current
3.5C
OUT
Three-State Output Capacitance
µA
µA
pF
pF
V
V
V
V
V
pF
µA
UNITS
TIMING CHARACTERISTICS
(AVDD= +5V ±5%, DVDD= DRVDD= +3.3V, f
CLK
= 2.048MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
nst
CLK
/ 2t
ACQ
Acquisition Time
Note 1: Reference inputs driven by operational amplifiers for Kelvin-sensed operation.
Note 2: For unipolar mode, the analog input voltage V
INP
must be within 0V and V
REF
, V
INN
= V
REF
/ 2; where V
REF
= V
RFPS
- V
RFNS
.
For differential mode, the analog inputs INP and INN must be within 0V and V
REF
; where V
REF
= V
RFPS
- V
RFNS
. The com-
mon mode of the inputs INP and INN is V
REF
/ 2.
Note 3: Minimum and maximum parameters are not tested. Guaranteed by design.
Note 4: R
I
varies inversely with sample rate.
Note 5: Calibration remains valid for temperature changes within ±20°C and power-supply variations ±5%.
Note 6: All AC specifications are shown for the differential mode.
ST_CAL = 1, Figure 8
f
CLK
cycles
17,400t
CAL
Calibration Time
I
SINK
= 1.6mA 70 400V
OL
Output Low Voltage mV
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