MAXIM MAX1070, MAX1071 Technical data

General Description

The MAX1070/MAX1071 low-power, high-speed, serial­output, 10-bit, analog-to-digital converters (ADCs) oper­ate at up to 1.5Msps. These devices feature true-differen­tial inputs, offering better noise immunity, distortion
improvements, and a wider dynamic range over single­ended inputs. A standard SPI™/QSPI™/MICROWIRE™
interface provides the clock necessary for conversion.
These devices easily interface with standard digital signal
processor (DSP) synchronous serial interfaces.

The MAX1070/MAX1071 operate from a single +2.7V to
+3.6V supply voltage and require an external reference.
The MAX1070 has a unipolar analog input, while the
MAX1071 has a bipolar analog input. These devices fea­ture a partial power-down mode and a full power-down
mode for use between conversions, which lower the sup­ply current to 1mA (typ) and 1µA (max), respectively. Also
featured is a separate power-supply input (VL), which
allows direct interfacing to +1.8V to VDDdigital logic. The
fast conversion speed, low-power dissipation, excellent
AC performance, and DC accuracy (±0.5 LSB INL) make
the MAX1070/MAX1071 ideal for industrial process con­trol, motor control, and base-station applications.

The MAX1070/MAX1071 come in a 12-pin TQFN pack­age, and are available in the commercial (0°C to +70°C)
and extended (-40°C to +85°C) temperature ranges.

Applications

Data Acquisition
Bill Validation
Motor Control
Communications
Portable Instruments

Features

♦ 1.5Msps Sampling Rate
♦ Only 18mW (typ) Power Dissipation
♦ Only 1µA (max) Shutdown Current
♦ High-Speed, SPI-Compatible, 3-Wire Serial Interface
♦ 61dB S/(N + D) at 525kHz Input Frequency
♦ Internal True-Differential Track/Hold (T/H)
♦ External Reference
♦ No Pipeline Delays
♦ Small 12-Pin TQFN Package

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

Typical Operating Circuit

19-3292; Rev 0; 5/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

查询MAX1070供应商

TOP VIEW

AIN-

1

2REF

3

AIN+11N.C.10SCLK

12

CNVST

9

DOUT

MAX1070
MAX1071

45

N.C.6GND

V

DD

TQFN

8

V

7RGND

L

PART TEMP RANGE

MAX1070CTC-T 0°C to +70°C 12 TQFN-12 Unipolar

MAX1070ETC-T -40°C to +85°C 12 TQFN-12 Unipolar
MAX1071CTC-T 0°C to +70°C 12 TQFN-12 Bipolar
MAX1071ETC-T -40°C to +85°C 12 TQFN-12 Bipolar

PIN­PACKAGE

INPUT

+1.8V TO V

V

GND

0.01µF

L

DOUT

CNVST

SCLK

DD

10µF10µF

µC/DSP

+2.7V TO +3.6V

DIFFERENTIAL

REF

4.7µF

INPUT

VOLTAGE

0.01µF

0.01µF

V

DD

+

AIN+

-

AIN-

MAX1070
MAX1071

REF

RGND

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +3.6V, VL= VDD, V

REF

= 2.048V, f

SCLK

= 24.0MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at V

DD

= 3V and TA= +25°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.

VDDto GND..............................................................-0.3V to +6V

V

L

to GND ................-0.3V to the lower of (VDD+ 0.3V) and +6V

Digital Inputs

to GND .................-0.3V to the lower of (V

DD

+ 0.3V) and +6V

Digital Output

to GND....................-0.3V to the lower of (V

L

+ 0.3V) and +6V

Analog Inputs and

REF to GND..........-0.3V to the lower of (V

DD

+ 0.3V) and +6V

RGND to GND .......................................................-0.3V to +0.3V

Maximum Current into Any Pin............................................50mA

Continuous Power Dissipation (T

A

= +70°C)

12-Pin TQFN (derate 16.9mW/°C above +70°C) ......1349mW

Operating Temperature Ranges

MAX107_ CTC ...................................................0°C to +70°C

MAX107_ ETC.................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ACCURACY

Resolution 10 Bits
Relative Accuracy INL (Note 1) ±0.5 LSB
Differential Nonlinearity DNL (Note 2) ±0.5 LSB
Offset Error ±2 LSB

Offset-Error Temperature
Coefficient

Gain Error Offset nulled ±2 LSB
Gain Temperature Coefficient ±2 ppm/°C
DYNAMIC SPECIFICATIONS (f
Signal-to-Noise Plus Distortion

Total Harmonic Distortion
Spurious-Free Dynamic Range SFDR -80 -74 dB

Intermodulation Distortion IMD f
Full-Power Bandwidth -3dB point 15 MHz
Full-Linear Bandwidth S/(N + D) > 56dB, single ended 2 MHz

CONVERSION RATE

Minimum Conversion Time t
Maximum Throughput Rate 1.5 Msps
M i ni m um Thr oug hp ut Rate ( N ote 4) 10 ksps
Track-and-Hold Acquisition Time t
Aperture Delay 5ns
Aperture Jitter (Note 6) 30 ps
External Clock Frequency f

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IN

= 525kHz sine wave, VIN = V

SINAD 60 61 dB

THD Up to the 5th harmonic -80 -74 dB

IN1

CONV

ACQ

SCLK

(Note 3) 0.667 µs

(Note 5) 125 ns

(Note 7) 24.0 MHz

= 250kHz, f

, unless otherwise noted.)

REF

= 300kHz -78 dB

IN2

±1 ppm/°C

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +3.6V, VL= VDD, V

REF

= 2.048V, f

SCLK

= 24.0MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at V

DD

= 3V and TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG INPUTS (AIN+, AIN-)

Differential Input Voltage Range V

Absolute Input Voltage Range 0 V
DC Leakage Current ±1 µA
Input Capacitance Per input pin 16 pF
Input Current (Average) Time averaged at maximum throughput rate 50 µA

REFERENCE INPUT (REF)

REF Input Voltage Range V

Input Capacitance 20 pF
DC Leakage Current ±1 µA
Input Current (Average) Time averaged at maximum throughput rate 200 µA

DIGITAL INPUTS (SCLK, CNVST)

Input-Voltage Low VIL 0.3 x V
Input-Voltage High VIH 0.7 x V
Input Leakage Current I

DIGITAL OUTPUT (DOUT)

Output Load Capacitance C
Output-Voltage Low V
Output-Voltage High V
Output Leakage Current I

POWER REQUIREMENTS

Analog Supply Voltage V
Digital Supply Voltage V

Analog Supply Current,
Normal Mode

Analog Supply Current,
Partial Power-Down Mode

Analog Supply Current,
Full Power-Down Mode

Digital Supply Current (Note 8)

Positive-Supply Rejection PSR Full-scale input, 3V +20%, -10% ±0.2 ±3.0 mV

IN

REF

IL

OUT

OL

OH

OL

DD

I

DD

I

DD

I

DD

AIN+ - AIN-, MAX1070 0 V
AIN+ - AIN-, MAX1071 -V

/ 2 +V

REF

1.0

L

0.05 ±10 µA

For stated timing performance 30 pF
I

= 5mA, VL ≥ 1.8V 0.4 V

SINK

I

= 1mA, VL ≥ 1.8V V L - 0.5V V

SOURCE

Output high impedance ±0.2 ±10 µA

2.7 3.6 V

L

Static, f

SCLK

= 24.0

1.8 V
57

Static, no SCLK 4 5
Operational, 1.5Msps 6 8
f

= 24.0MHz 1

SCLK

No SCLK 1
f

= 24.0MHz 1

SCLK

No SCLK
Operational, full-scale input at 1.5Msps
Static, f

SCLK

= 24.0MHz

Partial/full power-down mode,

= 24.0MHz

f

SCLK

Static, no SCLK (all modes)

0.3

0.3 1

0.15 0.5

0.1 0.3

0.1

REF

REF

DD

V

DD

50mV

DD

1

1

/ 2

+

L

V

V

V

V
V

V

mA

mA

µA

mA

µA

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

4 _______________________________________________________________________________________

Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and the offset

error have been nulled.

Note 2: No missing codes over temperature.
Note 3: Conversion time is defined as the number of clock cycles (16) multiplied by the clock period.
Note 4: At sample rates below 10ksps, the input full-linear bandwidth is reduced to 5kHz.
Note 5: The listed value of three SCLK cycles is given for full-speed continuous conversions. Acquisition time begins on the 14th ris-

ing edge of SCLK and terminates on the next falling edge of CNST. The IC idles in acquisition mode between conversions.

Note 6: Undersampling at the maximum signal bandwidth requires the minimum jitter spec for SINAD performance.
Note 7: 1.5Msps operation guaranteed for V

L

> 2.7V. See the Typical Operating Characteristics section for recommended sampling

speeds for V

L

< 2.7V.

Note 8: Digital supply current is measured with the V

IH

level equal to VL, and the VILlevel equal to GND.

TIMING CHARACTERISTICS

(VDD= +2.7V to +3.6V, VL= VDD, V

REF

= 2.048V, f

SCLK

= 24.0MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at V

DD

= 3V and TA= +25°C.)

Figure 1. Detailed Serial-Interface Timing

Figure 2. Load Circuits for Enable/Disable Times

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCLK Pulse-Width High t

SCLK Pulse-Width Low t

SCLK Rise to DOUT Transition t

DOUT Remains Valid After SCLK t
CNVST Fall to SCLK Fall t
CNVST Pulse Width t
Power-Up Time; Full Power-Down t
Restart Time; Partial Power-Down t

CH

CL

DOUT

DHOLDVL

SETUP

CSW

PWR-UP

RCV

VL = 2.7V to V

DD

VL = 1.8V to VDD, minimum recommended
(Note 7)

VL = 2.7V to V

DD

VL = 1.8V to VDD, minimum recommended
(Note 7)

CL = 30pF, VL = 2.7V to V
CL = 30pF, VL = 1.8V to V

= 1.8V to V
VL = 1.8V to V
VL = 1.8V to V

DD
DD
DD

DD
DD

18.7

22.5

18.7

22.5

17
24

4ns
10 ns
20 ns

2ms

16 Cycles

ns

ns

ns

CNVST

t

t

CL

t

CH

t

DHOLD

t

DOUT

SCLK

DOUT

t

SETUP

CSW

DOUT

6kΩ

a) HIGH-Z TO VOH, V
AND V

TO HIGH-Z

OH

GND

OL

TO VOH,

C

L

DOUT

b) HIGH-Z TO V
AND V

6kΩ

TO HIGH-Z

OL

V

L

C

L

GND

, V

TO VOL,

OL

OH

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VDD= +3V, VL= VDD, V

REF

= 2.048V, f

SCLK

= 24MHz, f

SAMPLE

= 1.5Msps, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

A

= +25°C.)

MAXIMUM RECOMMENDED f

SCLK

vs. V

L

MAX1070/71 toc01

VL (V)

f

SCLK

(MHz)

3.33.02.72.42.1

19

21

23

25

17

1.8 3.6

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1070)

MAX1070/71 toc02

DIGITAL OUTPUT CODE

INL (LSB)

768512256

-0.1

0

0.1

0.2

-0.2
0 1024

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1071)

MAX1070/71 toc03

DIGITAL OUTPUT CODE

INL (LSB)

2560-256

-0.1

0

0.1

0.2

-0.2

-512 512

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1070)

MAX1070/71 toc04

DIGITAL OUTPUT CODE

DNL (LSB)

768512256

-0.1

0

0.1

0.2

-0.2
0 1024

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1071)

MAX1070/71 toc05

DIGITAL OUTPUT CODE

DNL (LSB)

2560-256

-0.1

0

0.1

0.2

-0.2

-512 512

OFFSET ERROR

vs. TEMPERATURE (MAX1070)

MAX1070/71 toc06

TEMPERATURE (°C)

OFFSET ERROR (LSB)

6035-15 10

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

1.00

-1.00

-40 85

OFFSET ERROR

vs. TEMPERATURE (MAX1071)

MAX1070/71 toc07

TEMPERATURE (°C)

OFFSET ERROR (LSB)

6035-15 10

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

1.00

-1.00

-40 85

GAIN ERROR

vs. TEMPERATURE (MAX1070)

MAX1070/71 toc08

TEMPERATURE (°C)

GAIN ERROR (LSB)

6035-15 10

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

1.00

-1.00

-40 85

GAIN ERROR

vs. TEMPERATURE (MAX1071)

MAX1070/71 toc09

TEMPERATURE (°C)

GAIN ERROR (LSB)

6035-15 10

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

1.00

-1.00

-40 85

Typical Operating Characteristics (continued)

(VDD= +3V, VL= VDD, V

REF

= 2.048V, f

SCLK

= 24MHz, f

SAMPLE

= 1.5Msps, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

A

= +25°C.)

MAX1070/MAX1071

1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs

6 _______________________________________________________________________________________

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1070)

61.5

61.5

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1071)

-82

THD vs. INPUT FREQUENCY

61.4

61.3

61.2

DYNAMIC PERFORMANCE (dB)

61.1

61.0
100 500

ANALOG INPUT FREQUENCY (kHz)

SNR

SINAD

400300200

MAX1070/71 toc10

DYNAMIC PERFORMANCE (dB)

SFDR vs. INPUT FREQUENCY

90

88

86

SFDR (dB)

84

82

80

MAX1070

MAX1071

100 500

ANALOG INPUT FREQUENCY (kHz)

400300200

MAX1070/71 toc13

AMPLITUDE (dB)

61.4

61.3

SNR

61.2

61.1

61.0

100 500

ANALOG INPUT FREQUENCY (kHz)

SINAD

400300200

FFT PLOT (MAX1070)

0

fIN = 500kHz
SINAD = 61.2dB

-20

SNR = 61.2dB
THD = -83.5dB

-40

SFDR = 83.8dB

-60

-80

-100

-120

-140
0 750

ANALOG INPUT FREQUENCY (kHz)

MAX1070/71 toc11

-84

-86

THD (dB)

-88

-90

-92
100 500

MAX1070

MAX1071

400300200

ANALOG INPUT FREQUENCY (kHz)

MAX1070/71 toc12

FFT PLOT (MAX1071)

0

fIN = 500kHz
SINAD = 61.3dB

-20

MAX1070/71 toc14

625500375250125

SNR = 61.3dB
THD = -90dB

-40

SFDR = 85.4dB

-60

-80

AMPLITUDE (dB)

-100

-120

-140
0 750

ANALOG INPUT FREQUENCY (kHz)

MAX1070/71 toc15

625500375250125

TOTAL HARMONIC DISTORTION

vs. SOURCE IMPEDANCE

-50

-60

fIN = 500kHz

-70

THD (dB)

-80

-90

-100
10 1000

SOURCE IMPEDANCE (Ω)

fIN = 100kHz

100

MAX1070/71 toc16

TWO-TONE IMD PLOT (MAX1070)

0

-20

-40

-60

-80

AMPLITUDE (dB)

-100

-120

-140

f

IN1

0 750

ANALOG INPUT FREQUENCY (kHz)

f

IN1

f

IN2

IMD = -86.6dB

f

IN2

= 250.102kHz
= 299.966kHz

625500375250125

MAX1070/71 toc17

AMPLITUDE (dB)

TWO-TONE IMD PLOT (MAX1071)

0

-20

-40

f

-60

-80

-100

-120

-140

IN1

0 750

ANALOG INPUT FREQUENCY (kHz)

f

IN1

f

IN2

IMD = -83.4dB

f

IN2

= 250.102kHz
= 299.966kHz

625500375250125

MAX1070/71 toc18