19-4794; Rev 0; 11/98
KIT
ATION
EVALU
BLE
AVAILA
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
General Description
Features
o
Monolithic, 14-Bit, 1Msps ADC
o
+5V Single Supply
o
SNR of 80dB for f
IN
= 500kHz
o
SFDR of 87dB for f
IN
= 500kHz
o
Low Power Dissipation: 257mW
o
On-Demand Self-Calibration
o
Differential Nonlinearity Error: ±0.3LSB
o
Integral Nonlinearity Error: ±1.2LSB
o
Three-State, Two’s Complement Output Data
MAX1205
44
43
42
41
40
39
38
37
36
35
Imaging
Communications
Medical
Scanners
Data Acquisition
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
12
13
14
15
16
17
18
19
20
21
22
33
32
31
30
29
28
27
26
25
24
23
34
Applications
END_CAL
INN
N.C.
N.C.
INP
RFNS
RFNF
RFPS
RFPF
CM
TEST0
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 pro-
cess, uses a fully differential, pipelined architecture
with digital error correction and a short self-calibration
procedure that corrects for capacitor and gain mis-
matches 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 posi-
tive reference (RFPF) typically connected to +4.096V
and the negative reference (RFNF) connected to ana-
log ground. Additional sensing pins (RFPS, RFNS) are
provided to compensate for any resistive-divider action
that may occur due to finite internal and external resis-
tances in the reference traces and the on-chip resis-
tance 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 CMOS-
compatible, 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.
Ordering Information
PART
MAX1205CMH
MAX1205EMH
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
44 MQFP
44 MQFP
Pin Configuration
TOP VIEW
MAX1205
OE
DAV
CLK
DV
DD
DGND
DGND
DV
DD
TEST1
TEST2
TEST3
D0
________________________________________________________________
Maxim Integrated Products
D9
D8
D7
D6
DRV
DD
DGND
D5
D4
D3
D2
D1
MQFP
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
MAX1205
ABSOLUTE MAXIMUM RATINGS
AV
DD
to 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 (T
A
= +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
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
(AV
DD
= +5V ±5%, DV
DD
= DRV
DD
= +3.3V, V
RFPS
= +4.096V, V
RFNS
= AGND, V
CM
= +2.048V, V
IN
= -0.5dBFS, f
CLK
= 2.048MHz,
digital output load
≤
20pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
ANALOG INPUT
Input Voltage Range
(Notes 2, 3)
Input Resistance (Note 4)
Input Capacitance (Note 3)
REFERENCE/EXTERNAL
Reference Voltage (Note 3)
Reference Input Resistance
TRANSFER CHARACTERISTICS
Resolution (no missing codes)
(Note 5)
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Gain Error
Input-Referred Noise
DYNAMIC SPECIFICATIONS
(Note 6)
Maximum Sampling Rate
Conversion Time (Pipeline
Delay/Latency)
Acquisition Time
Overvoltage Recovery Time
Aperture Delay
Full-Power Bandwidth
Small-Signal Bandwidth
t
ACQ
t
OVR
t
AD
To full-scale step (0.006%)
f
SAMPLE
f
SAMPLE =
f
CLK /
2
1.024
4
100
410
3
3.3
78
Msps
f
SAMPLE
Cycles
ns
ns
ns
MHz
MHz
RES
INL
DNL
-1
-0.2
-5
After calibration, guaranteed
14
±1.2
±0.3
±0.003
-3.0
75
+1
+0.2
+5
Bits
LSB
LSB
%FSR
%FSR
µV
RMS
V
REF
700
4.096
1000
4.5
V
Ω
V
IN
R
I
C
I
Per side in track mode
Single-ended
Differential
4.096
±4.096
55
21
4.5
±4.5
V
kΩ
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= +5V ±5%, DV
DD
= DRV
DD
= +3.3V, V
RFPS
= +4.096V, V
RFNS
= AGND, V
CM
= +2.048V, V
IN
= -0.5dBFS, f
CLK
= 2.048MHz,
digital output load
≤
20pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Signal-to-Noise Ratio
(Note 5)
SYMBOL
f
IN
= 99.5kHz
SNR
f
IN
= 300.5kHz
f
IN
= 504.5kHz
Spurious-Free Dynamic Range
(Note 5)
f
IN
= 99.5kHz
SFDR
f
IN
= 300.5kHz
f
IN
= 504.5kHz
Total Harmonic Distortion
(Note 5)
f
IN
= 99.5kHz
THD
f
IN
= 300.5kHz
f
IN
= 504.5kHz
Signal-to-Noise Ratio plus
Distortion (Note 5)
POWER REQUIREMENTS
Analog Supply Voltage
Analog Supply Current
Digital Supply Voltage
Digital Supply Current
Output Drive Supply Voltage
Output Drive Supply Current
Power Dissipation
Warm-Up Time
Power-Supply Rejection Ratio
PSRR
Offset
Gain
55
55
AV
DD
I(AV
DD
)
DV
DD
I(DV
DD
)
DRV
DD
I(DRV
DD
)
PDSS
10pF loads on D0–D13 and DAV
3
0.1
257
0.1
3
0.4
4.75
5
51
5.25
70
5.25
1.2
DV
DD
0.6
377
V
mA
V
mA
V
mA
mW
sec
dB
f
IN
= 99.5kHz
SINAD
f
IN
= 300.5kHz
f
IN
= 504.5kHz
77
84
CONDITIONS
MIN
78
TYP
83
81.5
80
91
88
87
-86
-85
-84
82
79
78
dB
-80
dB
dB
dB
MAX
UNITS
MAX1205
_______________________________________________________________________________________
3
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
MAX1205
TIMING CHARACTERISTICS
(AV
DD
= +5V ±5%, DV
DD
= DRV
DD
= +3.3V, f
CLK
= 2.048MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Conversion Time
Clock Period
Clock High Time
Clock Low Time
Acquisition Time
Output Delay
DAV Pulse Width
CLK-to-DAV Rising Edge
Data Access Time
Bus Relinquish Time
Calibration Time
SYMBOL
t
CONV
t
CLK
t
CH
t
CL
t
ACQ
t
OD
t
DAV
t
S
t
AC
t
REL
t
CAL
ST_CAL = 1, Figure 8
C
L
= 20pF
187
187
CONDITIONS
MIN
TYP
4 / f
SAMPLE
488
244
244
t
CLK
/ 2
70
1 / f
CLK
65
16
16
17,400
145
75
75
150
301
301
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
f
CLK
cycles
DIGITAL INPUTS AND OUTPUTS
(AV
DD
= +5V ±5%, DV
DD
= DRV
DD
= +3.3V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Low Voltage
Input High Voltage
Input Capacitance
CLK Input Low Voltage
CLK Input High Voltage
CLK Input Capacitance
Digital Input Current
Clock Input Current
Output Low Voltage
Output High Voltage
Three-State Leakage Current
Three-State Output Capacitance
CLK
VIL
CLK
VIH
C
CLK
I
IN_
I
CLK
V
OL
V
OH
I
LEAKAGE
C
OUT
I
SINK
= 1.6mA
I
SOURCE
= 200µA
DV
DD
- 0.4
V
IN_
= 0 or DV
DD
-10
AV
DD
- 0.8
9
±0.1
±1
70
DV
DD
- 0.03
±0.1
3.5
±10
±10
+10
400
SYMBOL
V
IL
V
IH
DV
DD
- 0.8
4
0.8
CONDITIONS
MIN
TYP
MAX
0.8
UNITS
V
V
pF
V
V
pF
µA
µA
mV
V
µA
pF
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.
4
_______________________________________________________________________________________
+5V Single-Supply, 1Msps, 14-Bit
Self-Calibrating ADC
Typical Operating Characteristics
(AV
DD
= +5V ±5%, DV
DD
= DRV
DD
= +3.3V, V
RFPS
= +4.096V, V
RFNS
= AGND, V
CM
= +2.048V, differential input, f
CLK
= 2.048MHz,
calibrated, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY vs.
TWO’S COMPLEMENT OUTPUT CODE
MAX1205-01
MAX1205
DIFFERENTIAL NONLINEARITY vs.
TWO’S COMPLEMENT OUTPUT CODE
MAX1205-02
1.00
0.75
0.50
110
100
90
SFDR (dB)
dBFS
0.5
DNL (LSB)
INL (LSB)
0.25
0
-0.25
-0.50
-0.75
-1.00
-1.25
-8192 -6144 -4096 -2048 0
2048 4096 6144 8192
0
80
70
60
dBc
-0.5
50
40
-1.0
-8192 -6144 -4096 -2048 0
30
2048 4096 6144 8192
-80
-70
-60
-50
-40
-30
-20
-10
0
INPUT AMPLITUDE (dBFS)
TWO’S COMPLEMENT OUTPUT CODE
TWO’S COMPLEMENT OUTPUT CODE
SIGNAL-TO-NOISE RATIO PLUS
DISTORTION vs. INPUT FREQUENCY
MAX1205-04
TOTAL HARMONIC DISTORTION
vs. INPUT FREQUENCY
MAX1205-05
SIGNAL-TO-NOISE RATIO
vs. INPUT FREQUENCY
A
IN
= -0.5dBFS
80
A
IN
= -6dBFS
SNR (dB)
75
MAX1205-06
84
82
80
78
SINAD (dB)
76
74
72
70
68
66
64
1
10
100
A
IN
= -6dBFS
A
IN
= -0.5dBFS
85
-76
-78
-80
THD (dB)
-82
-84
-86
A
IN
= -20dBFS
A
IN
= -6dBFS
70
65
-88
A
IN
= -20dBFS
1000
-90
1
10
100
1000
INPUT FREQUENCY (kHz)
A
IN
= -0.5dBFS
60
1
10
100
1000
INPUT FREQUENCY (kHz)
A
IN
= -20dBFS
INPUT FREQUENCY (kHz)
SIGNAL-TO-NOISE RATIO PLUS DISTORTION
vs. SAMPLING RATE (f
IN
= 99.5kHz)
MAX1205-07
TYPICAL FFT
(f
IN
= 99.5kHz, 2048 VALUE RECORD)
-15
-30
AMPLITUDE (dBFS)
-45
-60
-75
-90
-105
-120
-135
MAX1205-08
85
A
IN
= -0.5dBFS
84
SINAD (dB)
83
82
81
80
0.1
1
SAMPLE RATE (Msps)
0
0
100
200
300
400
500
600
FREQUENCY (kHz)
_______________________________________________________________________________________
MAX1205-03
1.25
1.0
SINGLE-TONE SPURIOUS-FREE DYNAMIC RANGE
vs. INPUT AMPLITUDE (f
IN
= 99.5kHz)
120
5
FPGA/CPLD
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
