Fangtek ft690 Instruction
690- 0502273076 www.fangtek.com
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ft690
2W Mono BTL Audio Power Amplifier
General Description
The ft690 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other
portable communication device applications. It is capable
of delivering 1.25 watts of continuous average power to
an 8Ω BTL load and 2 watts of continuous average
power (DFN only) to a 4Ω BTL load with less than 1%
distortion (THD+N+N) from a 5VDC power supply.
The ft690 was designed specifically to provide high
quality output power with a minimal amount of external
components. The ft690 does not require output coupling
capacitors or bootstrap capacitors, and therefore is ideally
suited for mobile phone and other low voltage
applications where minimal power consumption is a
primary requirement.
The ft690 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by
either logic high or low depending on mode selection.
Driving the shutdown mode pin either high or low
enables the shutdown pin to be driven in a likewise
manner to enable shutdown.
The ft690 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during
turn-on and turn-off transitions.
The ft690 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
Improved PSRR at 217Hz & 1KHz 66dB
Power Output at 5.0V, 1% THD+N, 4Ω (QFN only)
2W (typ)
Power Output at 5.0V, 1% THD+N, 8Ω 1.25W (typ)
Power Output at 3.0V, 1% THD+N, 4Ω 600mW (typ)
Power Output at 3.0V, 1% THD+N, 8Ω 425mW (typ)
Shutdown Current 0.1μA (typ)
Features
Available in space-saving packages: DFN, MSOP,
WCSP
Ultra low current shutdown mode
Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
2.2 - 5.5V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Unity-gain stable
External gain configuration capability
User selectable shutdown High or Low logic Level
Applications
Mobile Phones
PDAs
Portable electronic device
Application Circuit
Figure 1.Typical Audio Amplifier Application Circuit (DFN)
Doc# ft690- 0502273076
December 15, 2006
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Figure 2.Typical Audio Amplifier Application Circuit (MSOP and WCSP)
ORDERING INFORMATION
P/N TEMP RANGE PIN-PACKAGE GAIN(dB)
ft690D
-40°C to +85°C 10pin DFN Adj.
ft690M
-40°C to +85°C 8pin MSOP Adj.
Ft690W
-40°C to +85°C 9pin WCSP Adj.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of data sheet.
ABSOLUTE MAXIMUM RATINGS
Unit
Supply voltage, VDD 6.0 V
Storage Temperature −65°C to +150°C
Input Voltage −0.3V to VDD +0.3V
Power Dissipation Internally Limited
ESD Susceptibility 2000V
Junction Temperature 150°C
θJC (MSOP) 56°C/W
θJA (MSOP) 190°C/W
θJC (WCSP) 180°C/W
θJA (DFN) 63°C/W
θJC (DFN) 12°C/W
Lead temperature 1,6 mm (1/16 Inch) from case for 10 seconds 260°C
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RECOMMENDED OPERATING CONDITIONS
MIN YP MAX UNIT
Supply voltage, VDD 2.5 5.5 V
High-level input voltage, VIH SHUTDOWN 2 V
Low-level input voltage, VIL SHUTDOWN 0.8 V
Common-mode input voltage, VIC VDD = 2.5 V, 5.5 V, CMRR ≤ -60 dB 0.5 VDD-0.8 V
Operating free-air temperature, TA -40 85 °C
Load impedance, ZL 6.4 8
Ω
ELECTRICAL CHARACTERISTICS
VDD=5V TA=25°C
Symbol Parameter Conditions Typical Limit Units(Limits)
VIN=0V, IO=0A, No Load 2.5 7 mA (max)
IDD Quiescent Power Supply Current
VIN=0V, IO=0A, 8 Ω Load 3 10 mA (max)
ISD Shutdown Current VSD= V
SD MODE
(WCSP only)
0.1 2.0 μA (max)
V
SDIH
Shutdown Voltage Input High V
SD MODE
= VDD 1.5 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= VDD 1.3 V
V
SDIH
Shutdown Voltage Input High V
SD MODE
= GND 1.5 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= GND 1.3 V
VOS Output Offset Voltage 7 50 mV (max)
9.7 K Ω (max)
R
OUT
Resistor Output to GND 8.5
7.0 K Ω (min)
Output Power (8 Ω) THD+N=1% (max); f=1kHz 1.25 0.9 W (min)
PO
(4Ω) THD+N=1% (max); f=1kHz 2 W
TWU Wake-up time 130 Ms
THD+N Total Harmonic Distortion+Noise PO = 0.5Wrms; f=1kHz 0.2 %
PSRR Power Supply Rejection Ratio
V
ripple
=200mV sine p-p
Input terminated with 10 Ω
66(f=217Hz)
76(f=1kHz)
55 dB (min)
V
DD
=3V TA=25°C
Symbol Parameter Conditions Typical Limit Units(Limits)
VIN=0V, IO=0A, No Load 1.6 7 mA (max)
IDD Quiescent Power Supply Current
V
IN
=0V, IO=0A, 8 Ω Load 2 9 mA (max)
ISD Shutdown Current VSD= V
SD MODE
(WCSP only)
0.1 2.0 μA (max)
V
SDIH
Shutdown Voltage Input High V
SD MODE
= VDD 1.1 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= VDD 0.9 V
V
SDIH
Shutdown Voltage Input High V
SD MODE
= GND 1.3 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= GND 1.0 V
VOS Output Offset Voltage 7 50 mV (max)
9.7 K Ω (max)
R
OUT
Resistor Output to GND 8.5
7.0 K Ω (min)
Output Power (8 Ω) THD+N=1% (max); f=1kHz 425 mW
PO
Output Power (4 Ω) THD+N=1% (max); f=1kHz 600 mW
TWU Wake-up time 80 Ms
THD+N Total Harmonic Distortion+Noise PO = 0.25Wrms; f=1kHz 0.1 %
PSRR Power Supply Rejection Ratio
V
ripple
=200mV sine p-p
Input terminated with 10 Ω
66(f=217Hz)
76(f=1kHz)
55 dB (min)
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VDD=2.6V TA=25°C
Symbol Parameter Conditions Typical Limit Units(Limits)
VIN=0V, IO=0A, No Load 1.5 mA (max)
IDD Quiescent Power Supply Current
VIN=0V, IO=0A, 8 Ω Load 2 mA (max)
ISD Shutdown Current VSD= V
SD MODE
(WCSP only) 0.1 μA (max)
V
SDIH
Shutdown Voltage Input High V
SD MODE
= VDD 1.0 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= VDD 0.9 V
V
SDIH
Shutdown Voltage Input High V
SD MODE
= GND 1.2 V
V
SDIL
Shutdown Voltage Input Low V
SD MODE
= GND 1.0 V
VOS Output Offset Voltage 5 50 mV (max)
9.7 K Ω (max)
R
OUT
Resistor Output to GND 8.5
7.0 K Ω (min)
Output Power (8 Ω) THD+N=1% (max); f=1kHz 300 mW
PO
Output Power (4 Ω) THD+N=1% (max); f=1kHz 400 mW
TWU Wake-up time 70 Ms
THD+N+N Total Harmonic Distortion+Noise PO = 0.15Wrms; f=1kHz 0.1 %
PSRR Power Supply Rejection Ratio
V
ripple
=200mV sine p-p
Input terminated with 10 Ω
66(f=217Hz)
76(f=1kHz)
55 dB (min)
PIN DESCRIPTION
DFN Package
MSOP Package
Top View
Order Number ft690D
Top View
Order Number ft690M
WCSP Package
Top View
Order Number ft690W
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Package DFN MSOP WCSP
Shutdown Mode Selectable Low Low
Typical Power Output at 5V,
1% THD+N
2W (R
L
=4)
1.25W (RL=8Ω)
1.25W (RL=8)
A SD_MODE select pin determines the Shutdown Mode for the DFN package, whether it is an Asserted High or an Asserted Low device,
to activate shutdown.
The SD_MODE select pin is with the MSOP and WCSP packaged devices, shutdown occurs only with an low assertion.
Typical Performance Characteristics
LD and MH Specific Characteristics
THD+N+N vs Frequency
Vdd=5V, RL=8Ω, Po=0.5W
0.01
0.1
1
10
10 100 1000 10000 100000
Frequency (Hz)
THD+N (%)
THD+N+ N vs Fre quency
Vdd=3V, RL=8Ω, Po=0.25 W
0.01
0.1
1
10
10 100 1000 10000 100000
Frequency (Hz)
THD+N (%)
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