MAXIM MAX1076, MAX1078 Technical data

General Description

The MAX1076/MAX1078 are low-power, high-speed, seri­al-output, 10-bit, analog-to-digital converters (ADCs) that
operate at up to 1.8Msps 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 MAX1076/MAX1078 operate from a single +4.75V to
+5.25V supply voltage. The MAX1076/MAX1078 include
a 4.096V internal reference. The MAX1076 has a unipolar
analog input, while the MAX1078 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 MAX1076/MAX1078
ideal for industrial process control, motor control, and
base-station applications.

The MAX1076/MAX1078 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

♦ 1.8Msps Sampling Rate
♦ Only 50mW (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 4.096V Reference
♦ No Pipeline Delays
♦ Small 12-Pin TQFN Package

MAX1076/MAX1078

1.8Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

Typical Operating Circuit

19-3291; 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MAX1076CTC-T供应商

PART TEMP RANGE

MAX1076CTC-T 0°C to +70°C 12 TQFN-12 Unipolar

MAX1076ETC-T -40°C to +85°C 12 TQFN-12 Unipolar
MAX1078CTC-T 0°C to +70°C 12 TQFN-12 Bipolar
MAX1078ETC-T -40°C to +85°C 12 TQFN-12 Bipolar

PIN­PACKAGE

INPUT

TOP VIEW

1

AIN-

2REF

3

AIN+11N.C.10SCLK

12

CNVST

9

DOUT

MAX1076
MAX1078

45

N.C.6GND

V

DD

TQFN

8

V

7RGND

+4.75V TO +5.25V

DIFFERENTIAL

VOLTAGE

L

4.7µF

+1.8V TO V

DD

INPUT

0.01µF

0.01µF

V

DD

+

AIN+

-

AIN-

MAX1076
MAX1078

REF

RGND

V

GND

0.01µF

L

DOUT

CNVST

SCLK

10µF10µF

µC/DSP

MAX1076/MAX1078

1.8Msps, Single-Supply, Low-Power, True­Differential, 10-Bit ADCs with Internal Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +5V ±5%, VL= VDD, f

SCLK

= 28.8MHz, 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

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, small-signal method 20 MHz
Full-Linear Bandwidth S/(N + D) > 56dB, single ended 2 MHz

CONVERSION RATE

Minimum Conversion Time t
Maximum Throughput Rate 1.8 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

= 525kHz sine wave, VIN = V

IN

SINAD 60 61 dB

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

= 250kHz, f

IN1

CONV

ACQ

SCLK

(Note 3) 0.556 µs

(Note 5) 104 ns

, unless otherwise noted.)

REF

= 300kHz -78 dB

IN2

±1 ppm/°C

28.8 MHz

MAX1076/MAX1078

1.8Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±5%, VL= VDD, f

SCLK

= 28.8MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +25°C.)

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 75 µA

REFERENCE OUTPUT (REF)

REF Output Voltage Range Static, TA = +25°C 4.086 4.096 4.106 V
Voltage Temperature Coefficient ±50 ppm/°C

Load Regulation

Line Regulation VDD = 4.75V to 5.25V, static 0.5 mV/V

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 7)

Positive-Supply Rejection PSR VDD = 5V ±5%, full-scale input ±0.2 ±3.0 mV

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AIN+ - AIN-, MAX1076 0 V

IN

AIN+ - AIN-, MAX1078 -V

I

SOURCE

I

= 0 to 200µA 0.5

SINK

IL

OUT

OH
OL

DD

I

DD

I

DD

I

DD

For stated timing performance 30 pF
I

OL

L

= 5mA, VL ≥ 1.8V 0.4 V

SINK

I

SOURCE

Output high impedance ±0.2 ±10 µA

Static, f

SCLK

Static, no SCLK 5 7
Operational, 1.8Msps 10 13
f

= 28.8MHz 2

SCLK

No SCLK 2
f

= 28.8MHz 1

SCLK

No SCLK
Operational, full-scale input at 1.8Msps
Static, f

SCLK

Partial/full power-down mode,

= 28.8MHz

f

SCLK

Static, no SCLK (all modes)

= 0 to 2mA 0.3

= 1mA, VL ≥ 1.8V V L - 0.5V V

= 28.8MHz

= 28.8MHz

REF

/ 2 +V

REF

L

0.05 ±10 µA

4.75 5.25 V

1.8 V
811

0.3
1 2.5

0.4 1

0.2 0.5

0.1

/ 2

REF

DD

L

DD

1

1µA

mV/mA

V

V

V
V

V

mA

mA

µA

mA

MAX1076/MAX1078

1.8Msps, 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 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: Digital supply current is measured with the V

IH

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

TIMING CHARACTERISTICS

(VDD= +5V ±5%, VL= VDD, f

SCLK

= 28.8MHz, 50% duty cycle, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

A

= +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

VL = 1.8V to V
VL = 1.8V to V
CL = 30pF, VL = 4.75V to V

DOUT

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

DHOLDVL

SETUP

CSW

PWR-UP

RCV

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

DD
DD

DD
DD
DD

DD
DD
DD

15.6 ns

15.6 ns
14
17
24

4ns
10 ns
20 ns

2ms

16 Cycles

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

MAX1076/MAX1078

1.8Msps, Single-Supply, Low-Power, True-

Differential, 10-Bit ADCs with Internal Reference

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VDD= +5V, VL= VDD, f

SCLK

= 28.8MHz, f

SAMPLE

= 1.8Msps, TA= T

MIN

to T

MAX

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

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1076)

MAX1076/78 toc01

DIGITAL OUTPUT CODE

INL (LSB)

756512256

-0.1

0

0.1

0.2

-0.2
0 1024

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1078)

MAX1076/78 toc02

DIGITAL OUTPUT CODE

INL (LSB)

2560-256

-0.1

0

0.1

0.2

-0.2

-512 512

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1076)

MAX1076/78 toc03

DIGITAL OUTPUT CODE

INL (LSB)

756512256

-0.1

0

0.1

0.2

-0.2
0 1024

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE (MAX1078)

MAX1076/78 toc04

DIGITAL OUTPUT CODE

INL (LSB)

2560-256

-0.1

0

0.1

0.2

-0.2

-512 512

OFFSET ERROR

vs. TEMPERATURE (MAX1076)

MAX1076/78 toc05

TEMPERATURE (°C)

OFFSET ERROR (LSB)

603510-15

-0.25

0

0.25

0.50

-0.50

-40 85

OFFSET ERROR

vs. TEMPERATURE (MAX1078)

MAX1076/78 toc06

TEMPERATURE (°C)

OFFSET ERROR (LSB)

603510-15

-0.25

0

0.25

0.50

-0.50

-40 85

GAIN ERROR

vs. TEMPERATURE (MAX1076)

MAX1076/78 toc07

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 (MAX1078)

MAX1076/78 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

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1076)

MAX1076/78 toc09

ANALOG INPUT FREQUENCY (kHz)

DYNAMIC PERFORMANCE (dB)

400300200

61.1

61.2

61.3

61.4

61.5

61.6

61.0
100 500

SNR

SINAD

VDD/VL FULL POWER-DOWN SUPPLY

CURRENT vs. TEMPERATURE

MAX1076/78 toc18

TEMPERATURE (°C)

V

DD

/V

L

SUPPLY CURRENT (µA)

603510-15

0.2

0.4

0.6

0.8

1.0

0

-40 85

VDD, f

SCLK

= 28.8MHz

VDD, NO SCLK

VL, NO SCLK

Typical Operating Characteristics (continued)

(VDD= +5V, VL= VDD, f

SCLK

= 28.8MHz, f

SAMPLE

= 1.8Msps, TA= T

MIN

to T

MAX

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

MAX1076/MAX1078

1.8Msps, Single-Supply, Low-Power, True­Differential, 10-Bit ADCs with Internal Reference

6 _______________________________________________________________________________________

DYNAMIC PERFORMANCE

vs. INPUT FREQUENCY (MAX1078)

62.00

61.75

61.50

61.25

DYNAMIC PERFORMANCE (dB)

61.00
100 500

ANALOG FREQUENCY (kHz)

0

-20

-40

-60

-80

AMPLITUDE (dB)

-100

-120

FFT PLOT (MAX1076)

fIN = 500kHz
SINAD = 61.5dB
SNR = 61.4dB
THD = -88.5dB
SFDR = 87.0dB

SNR

SINAD

400300200

MAX1076/78 toc10

THD (dB)

MAX1076/78 toc13

AMPLITUDE (dB)

THD vs. INPUT FREQUENCY

-80

MAX1076

-82

-84

-86

-88

-90

-92

-94

-96

100 500

MAX1078

400300200

ANALOG INPUT FREQUENCY (kHz)

FFT PLOT (MAX1078)

0

fIN = 500kHz
SINAD = 61.4dB

-20

SNR = 61.5dB
THD = -93.8dB

-40

SFDR = 84.5dB

-60

-80

-100

-120

MAX1076/78 toc11

MAX1076/78 toc14

SFDR vs. INPUT FREQUENCY

90

88

86

SFDR (dB)

84

82

100 500

MAX1078

MAX1076

ANALOG INPUT FREQUENCY (kHz)

TOTAL HARMONIC DISTORTION

vs. SOURCE IMPEDANCE

-50

-60

fIN = 500kHz

-70

THD (dB)

-80

-90

fIN = 100kHz

MAX1076/78 toc12

400300200

MAX1076/78 toc15

-140
0 900

ANALOG FREQUENCY (kHz)

TWO-TONE IMD PLOT (MAX1076)

0

-20

-40

f

IN1

-60

-80

AMPLITUDE (dB)

-100

-120

-140
0 1000

ANALOG FREQUENCY (kHz)

-140

750600450300150

0 900

ANALOG FREQUENCY (kHz)

750600450300150

-100
10 1000

100

SOURCE IMPEDANCE (Ω)

TWO-TONE IMD PLOT (MAX1078)

f

= 2Msps

SAMPLE

= 250.039kHz

f

IN1

= 300.059kHz

f

IN2

IMD = -81.9dB

f

IN2

800600400200

MAX1076/78 toc16

0

-20

-40

f

IN1

-60

-80

AMPLITUDE (dB)

-100

-120

-140
0 1000

ANALOG FREQUENCY (kHz)

f

IN2

f

SAMPLE

f

IN1

f

IN2

IMD = 82.1dB

= 2Msps
= 250.039kHz
= 300.059kHz

800600400200

MAX1076/78 toc17