Rainbow-electronics MAXQ7667 Manual de usuario descargar pdf (Pagina 2)

MAXQ7667

16-Bit, RISC, Microcontroller-Based,

Ultrasonic Distance-Measuring System

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

DVDDIO

= +5V, V

AVDD

= +3.3V; V

DVDD

= +2.5V, system clock (f

SYSCLK

) = 16MHz, burst frequency (f

BURST

) = bandpass frequency

BPF

) = 50kHz, C

REFBG

= C

REF

= 1µF in parallel with 0.01µF, f

ADCCLK

= 2MHz (SAR data rate = 125ksps), T

= T

MIN

to T

MAX

, unless

otherwise specified. Typical values are at T

= +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.

DVDDIO, GATE5, REG3P3, REG2P5 to

DGND ................................................................-0.3V to +6.0V

AVDD to AGND .....................................................-0.3V to +4.0V

DVDD to DGND .....................................................-0.3V to +3.0V

DVDDIO to DVDD..................................................-0.3V to +6.0V

AVDD to DVDD......................................................-0.3V to +4.0V

AGND to DGND.....................................................-0.3V to +0.3V

Digital Inputs/Outputs to DGND..........-0.3V to (V

DVDDIO

+ 0.3V)

Analog Inputs/Outputs to AGND ............-0.3V to (V

AVDD

+ 0.3V)

XIN, XOUT to DGND ..............................-0.3V to (V

DVDD

+ 0.3V)

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

Continuous Power Dissipation (T

= +70°C)

48-Pin LQFP (derate 21.7mW/°C above +70°C).....1739.1mW

Operating Temperature Range .........................-40°C to +125°C

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

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ECHO INPUT (Low-Noise Amplifier and Sigma-Delta ADC)

VGA gain adjust = 1.55µV

P-P

/LSB 5.6

Input-Referred Noise

(Note 1)

VGA gain adjust = 0.1µV

P-P

/LSB 0.7

µV

RMS

VGA gain adjust = 1.55µV

P-P

/LSB 80

Minimum Detectable Signal

VGA gain adjust = 0.1µV

P-P

/LSB 10

µV

P-P

VGA gain adjust = 1.55µV

P-P

/LSB,

unclipped

100

Operating Input Range

VGA gain adjust = 0.1µV

P-P

/LSB,

unclipped

6.7

P-P

VGA gain adjust

= 1.55µV

P-P

/LSB

1.55

Programmable Gain

From echo input to

bandpass filter in

reply to input

VGA gain adjust

= 0.1µV

P-P

/LSB

0.1

µV

P-P

/LSB

Programmable-Gain Adjust

Resolution

(Note 2) 10 %

LNA Bandwidth 150 kHz

ADC Sampling Rate 80 x f

BPF

kHz

ADC Output Data Rate 10 x f

BPF

kHz

ADC Output Data Resolution 16 Bits

Echo-Input Resistance R

For each echo input 14 k

Echo-Input Capacitance 14 pF

Echo-Input DC Bias Voltage V

AVDD

/2 V

Maximum Overvoltage

Recovery Time

Recover from 2V

P-P

input 10 µs

1 2 3 4 5 6 7 ... 39 40

MAXQ7667 1

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Rainbow-electronics MAXQ7667 Manual de usuario Pagina 2

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