MAXIM MAX1077, MAX1079 Technical data

General Description

The MAX1077/MAX1079 are low-power, high-speed, seri­al-output, 10-bit, analog-to-digital converters (ADCs) that
operate at up to 1.5Msps and have an internal reference.
These devices feature true-differential inputs, offering bet­ter noise immunity, distortion improvements, and a wider
dynamic range over single-ended 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 MAX1077/MAX1079 operate from a single +2.7V to
+3.6V supply voltage. The MAX1077/MAX1079 include a

2.048V internal reference. The MAX1077 has a unipolar
analog input, while the MAX1079 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 2mA (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 MAX1077/MAX1079
ideal for industrial process control, motor control, and
base-station applications.

The MAX1077/MAX1079 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 Communications

Bill Validation Portable Instruments

Motor Control

Features

♦ 1.5Msps Sampling Rate

♦ Only 22mW (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)

♦ Internal 2.048V Reference

♦ No Pipeline Delays

♦ Small 12-Pin TQFN Package

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

________________________________________________________________ Maxim Integrated Products 1

12

AIN+11N.C.10SCLK

45

N.C.6GND

1

2REF

3

9

8

7RGND

CNVST

DOUT

V

L

MAX1077
MAX1079

AIN-

V

DD

TQFN

TOP VIEW

Pin Configuration

Ordering Information

MAX1077
MAX1079

DOUT

AIN+

4.7µF

10µF10µF

+2.7V TO +3.6V

0.01µF

0.01µF

0.01µF

+1.8V TO V

DD

AIN-

REF

V

DD

DIFFERENTIAL

INPUT

VOLTAGE

RGND

V

L

GND

CNVST

SCLK

µC/DSP

+

-

Typical Operating Circuit

19-3363; Rev 0; 8/04

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LMX321AUK-供应商

PART TEMP RANGE

MAX1077CTC-T 0°C to +70°C 12 TQFN-12 Unipolar

MAX1077ETC-T -40°C to +85°C 12 TQFN-12 Unipolar
MAX1079CTC-T 0°C to +70°C 12 TQFN-12 Bipolar
MAX1079ETC-T -40°C to +85°C 12 TQFN-12 Bipolar

PIN­PACKAGE

INPUT

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True­Differential, 10-Bit ADCs with Internal Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

SCLK

= 24MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +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

PARAMETER

CONDITIONS

UNITS

DC ACCURACY

Resolution 10 Bits

Relative Accuracy INL (Note 1)

LSB

Differential Nonlinearity DNL (Note 2)

LSB

Offset Error ±2 LSB

Offset-Error Temperature
Coefficient

±1

ppm/°C

Gain Error Offset nulled ±2 LSB

Gain Temperature Coefficient ±2

ppm/°C

DYNAMIC SPECIFICATIONS (f

IN

= 525kHz sine wave, VIN = V

REF

, unless otherwise noted.)

Signal-to-Noise Plus Distortion

SINAD 60 61 dB

Total Harmonic Distortion

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

Spurious-Free Dynamic Range SFDR -80 -74 dB

Intermodulation Distortion IMD f

IN1

= 250kHz, f

IN2

= 300kHz -78 dB

Full-Power Bandwidth -3dB point, small-signal method 15

MHz

Full-Linear Bandwidth S/(N + D) > 56dB, single ended 1.2

MHz

CONVERSION RATE

Minimum Conversion Time t

CONV

(Note 3)

µs

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

ACQ

(Note 5) 125 ns

Aperture Delay 5ns

Aperture Jitter (Note 6) 30 ps

External Clock Frequency f

SCLK

(Note 7) 24

MHz

SYMBOL

MIN TYP MAX

-0.5 +0.5

-0.5 +0.5

0.667

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

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

SCLK

= 24MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ANALOG INPUTS (AIN+, AIN-)

AIN+ - AIN-, MAX1077 0

Differential Input Voltage Range

V

IN

AIN+ - AIN-, MAX1079

V

Absolute Input Voltage Range 0

V

DC Leakage Current ±1 µA

Input Capacitance Per input pin 16 pF

Input Current (Average)

75 µA

REFERENCE OUTPUT (REF)

REF Output Voltage Range Static, TA = +25°C

V

Voltage Temperature Coefficient

ppm/°C

I

SOURCE

= 0 to 2mA

Load Regulation

I

SINK

= 0 to 100µA 1.0

mV/mA

Line Regulation VDD = 2.7V to 3.6V, static

mV/V

DIGITAL INPUTS (SCLK, CNVST)

Input Voltage Low VIL

V

Input Voltage High VIH 0.7 x V

L

V

Input Leakage Current I

IL

µA

DIGITAL OUTPUT (DOUT)

Output Load Capacitance C

OUT

For stated timing performance 30 pF

Output Voltage Low V

OL

I

SINK

= 5mA, VL ≥ 1.8V 0.4 V

Output Voltage High V

OH

I

SOURCE

= 1mA, VL ≥ 1.8V

V

Output Leakage Current I

OL

Output high impedance

µA

POWER REQUIREMENTS

Analog Supply Voltage V

DD

2.7 3.6 V

Digital Supply Voltage V

L

1.8

V

Static, f

SCLK

= 24MHz

68

Static, no SCLK 5 7

Analog Supply Current,
Normal Mode

I

DD

Operational, 1.5Msps 7 9

mA

f

SCLK

= 24MHz 2

Analog Supply Current,
Partial Power-Down Mode

I

DD

No SCLK 2

mA

f

SCLK

= 24MHz 1

Analog Supply Current,
Full Power-Down Mode

I

DD

No SCLK

1

µA

Operational, full-scale input at 1.5Msps

0.3 1

Static, f

SCLK

= 24MHz

Partial/full power-down mode,
f

SCLK

= 24MHz

0.1 0.3

mA

Digital Supply Current (Note 8)

Static, no SCLK (all modes)

1µA

Positive-Supply Rejection PSR VDD = 3V +20% -10%, full-scale input

mV

Time averaged at maximum throughput rate

-V

/ 2 +V

REF

2.038 2.048 2.058

V L - 0.5V

±50

0.35

0.25

0.05 ±10

±0.2 ±10

0.3

0.15 0.5

0.1

±0.2 ±3.0

V

REF

REF

V

DD

0.3 x V

V

DD

/ 2

L

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True­Differential, 10-Bit ADCs with Internal Reference

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 CNVST. 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, f

SCLK

= 24MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VL = 2.7V to V

DD

SCLK Pulse-Width High t

CH

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

ns

VL = 2.7V to V

DD

SCLK Pulse-Width Low t

CL

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

ns

SCLK Rise to DOUT Transition t

DOUT

CL = 30pF, VL = 1.8V to V

DD

24

ns

DOUT Remains Valid After SCLK

VL = 1.8V to V

DD

4ns

CNVST Fall to SCLK Fall t

SETUP

VL = 1.8V to V

DD

10 ns

CNVST Pulse Width t

CSW

VL = 1.8V to V

DD

20 ns

Power-Up Time; Full Power-Down

2ms

Restart Time; Partial Power-Down

t

RCV

16

Cycles

Figure 1. Detailed Serial-Interface Timing

GND

6kΩ

C

L

DOUT

DOUT

C

L

GND

V

L

a) HIGH-Z TO VOH, V

OL

TO VOH,

AND V

OH

TO HIGH-Z

b) HIGH-Z TO V

OL

, V

OH

TO VOL,

AND V

OL

TO HIGH-Z

6kΩ

Figure 2. Load Circuits for Enable/Disable Times

18.7

22.5

18.7

22.5

t

DHOLD

t

PWR-UP

CL = 30pF, VL = 2.7V to V

DD

17

CNVST

t

CL

t

CH

SCLK

t

SETUP

t

CSW

DOUT

t

DHOLD

t

DOUT

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

_______________________________________________________________________________________ 5

Typical Operating Characteristics

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

SCLK

= 24MHz, f

SAMPLE

= 1.5Msps, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

MAXIMUM RECOMMENDED f

SCLK

vs. V

L

MAX1077/79 toc01

VL (V)

f

SCLK

(MHz)

3.33.02.72.42.1

19

21

23

25

17

1.8 3.6

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 256 512 768 1024

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1077)

MAX1077/79 toc02

DIGITAL OUTPUT CODE

INL (LSB)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

-512 -256 0 256 512

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1079)

MAX1077/79 toc03

DIGITAL OUTPUT CODE

INL (LSB)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 256 512 768 1024

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1077)

MAX1077/79 toc04

DIGITAL OUTPUT CODE

DNL (LSB)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

-512 -256 0 256 512

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1079)

MAX1077/79 toc05

DIGITAL OUTPUT CODE

DNL (LSB)

0

-0.50

-1.00

-1.50

-2.00

-40 10-15 35 60 85

OFFSET ERROR

vs. TEMPERATURE (MAX1077)

MAX1077/79 toc06

TEMPERATURE (°C)

OFFSET ERROR (LSB)

0

-0.50

-1.00

-1.50

-2.00

-40 10-15 35 60 85

OFFSET ERROR

vs. TEMPERATURE (MAX1079)

MAX1077/79 toc07

TEMPERATURE (°C)

OFFSET ERROR (LSB)

1.00

0.50

0

-0.50

-1.00

-40 10-15 35 60 85

GAIN ERROR

vs. TEMPERATURE (MAX1077)

MAX1077/79 toc08

TEMPERATURE (°C)

GAIN ERROR (LSB)

1.00

0.50

0

-0.50

-1.00

-40 10-15 35 60 85

GAIN ERROR

vs. TEMPERATURE (MAX1079)

MAX1077/79 toc09

TEMPERATURE (°C)

GAIN ERROR (LSB)

TWO-TONE IMD PLOT (MAX1079)

MAX1077/79 toc18

ANALOG INPUT FREQUENCY (kHz)

AMPLITUDE (dB)

625500375250125

-120

-100

-80

-60

-40

-20

0

-140
0750

f

IN1

= 250.102kHz

f

IN2

= 299.966kHz

IMD = -83.4dB

f

IN1

f

IN2

Typical Operating Characteristics (continued)

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

SCLK

= 24MHz, f

SAMPLE

= 1.5Msps, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

MAX1077/MAX1079

1.5Msps, Single-Supply, Low-Power, True­Differential, 10-Bit ADCs with Internal Reference

6 _______________________________________________________________________________________

62.0

61.5

61.0

60.5

60.0
100 300200 400 500

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1077)

MAX1077/79 toc10

ANALOG INPUT FREQUENCY (kHz)

DYNAMIC PERFORMANCE (dB)

SNR AND SINAD

62.0

61.5

61.0

60.5

60.0
100 300200 400 500

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1079)

MAX1077/79 toc11

ANALOG INPUT FREQUENCY (kHz)

DYNAMIC PERFORMANCE (dB)

SNR AND SINAD

-80

-84

-88

-92

-96
100 300200 400 500

THD vs. INPUT FREQUENCY

MAX1077/79 toc12

ANALOG INPUT FREQUENCY (kHz)

THD (dB)

MAX1079

MAX1077

82

84

88

86

90

92

SFDR vs. INPUT FREQUENCY

MAX1077/79 toc13

ANALOG INPUT FREQUENCY (kHz)

SFDR (dB)

100 300200 400 500

MAX1077

MAX1079

-140

-100

-120

-60

-80

-20

-40

0

0250375125 500 625 750

FFT PLOT (MAX1077)

MAX1077/79 toc14

ANALOG INPUT FREQUENCY (kHz)

AMPLITUDE (dB)

fIN = 500kHz
SINAD = 61.2dB
SNR = 61.2dB
THD = -81.7dB
SFDR = 83.5dB

-140

-100

-120

-60

-80

-20

-40

0

0 250 375125 500 625 750

FFT PLOT (MAX1079)

MAX1077/79 toc15

ANALOG INPUT FREQUENCY (kHz)

AMPLITUDE (dB)

fIN = 500kHz
SINAD = 61.2dB
SNR = 61.2dB
THD = -91.3dB
SFDR = 88.7dB

TOTAL HARMONIC DISTORTION

vs. SOURCE IMPEDANCE

MAX1077/79 toc16

SOURCE IMPEDANCE (Ω)

THD (dB)

100

-90

-80

-70

-60

-50

-100
10 1000

fIN = 500kHz

fIN = 100kHz

TWO-TONE IMD PLOT (MAX1077)

MAX1077/79 toc17

ANALOG INPUT FREQUENCY (kHz)

AMPLITUDE (dB)

625500375250125

-120

-100

-80

-60

-40

-20

0

-140
0750

f

IN1

= 250.102kHz

f

IN2

= 299.966kHz

IMD = -86.6dB

f

IN1

f

IN2