Asahi KASEI AK5736 User Manual

Temperature Characteristic of Power Supply Current
The AK5736 is 6ch ADC (Analog to Digital Converter) equipped with the diagnostic function which can
monitor connection state of a microphone and input harness. This product can be operated with very low
latency and is perfect for ANC (Active Noise Canceller) that needs high speed operation.
In this application note, the measurement results of temperature characteristics and power supply
dependence of power consumption are shown for a power supply design considering any condition of
temperature and voltage.
In this chapter, the power supply dependency and the thermal characteristics of the AK5736 are shown
as the measurement result under the following
No. Monitor Pin
1 All power supply pins
2 All power supply pins
3 All power supply pins
4 All power supply pins
5 CPVDD
Note 1. LDOE pin = "L": LOD is disable, LODE pin = "H": LDO is enable
Note 2. CPEN pin = "L": Internal Generation Mode, CPEN pin = "H": Outside Supply Mode
Note 3. Iout: Current from the CPOUT pin
Current consumption depends on power supply voltage, but it is not related to temperature.
In "Internal Generation Mode", the current consumption of CPVDD accounts the most of the current
consumption of the AK5736. It does not depend on temperature but it is related to "I
from the CPOUT pin regardless of the CPEN pin status. The "I
current flowing from MIC bias generator (MPWR)"
In the datasheet, the consumption of CPVDD is the value when the current flowing from MIC bias
generator is 80mA (I
out
C004-01

2. Measurement Result

Table 1. Condition and Result of Current Consumption
Condition
LDOE CPEN
pin pin
H H
L H
H L
L L
L L
= 97mA).
AK5736 User's Guide

1. Outline

conditions. This result was
Measurement Item and Result
Thermal
Characteristic
No
No
No
No
No
" current is estimated as "17mA + the
out
- 1 -
measured with 1 sample.
Power Supply I
out
Dependency Dependency
Yes
Yes
Yes
Yes
Yes
" current flowing
out
[AK5736]
-
-
-
-
Yes
2018/06