Sept, 2010 Rev 1.0 Page 1 / 8
ISD-DEMO8101 User’s Manual
The ISD-DEMO8101 is a SOP8 demo board for ISD8101 series. It is available to demonstrate
basic functionality and to make it easy to try different configurations of components and
component values.
In the standard configuration, there are no pins on any of the input/output pads on the PCB, and
may be either soldered with wires or jumper pins. As a fast way to test, it is found that the larger
size "E-Z Hook" style clip lead probe wires can attach easily to the holes around the outside edge
of the PCB.
The picture below illustrates all the input controls and BTL speaker output.
Figure 1: ISD-DEMO8101EVB Pins and Jumpers Definition
Speaker
Power
SPP
Ground
JSE
SPN
VSS
VDD
JCE
JON
Ground
R10
R1
R4
R3
R6
ACN
ACP
CE
Point
Sept, 2010 Rev 1.0 Page 2 / 8
Figure 2: ISD-DEMO8101EVB Possible Connections
Hardware Connections:
Connect an 8Ω or larger loading speaker to SPP and SPN.
Connect a power supply to the related terminals. Please ensure the polarity of the power is
correct to avoid any damages to the ISD8101 device.
Connect CE either to VDD or Ground, and CE is active High
Unity gain set of inputs: LPN and LPP are configured for low gain configurations. In the
single ended use scenario, the signal may be applied only to the LPN input.
A 20dB gain set of inputs: ACN and ACP are configured for high gain configurations. In
the single ended use scenario, the signal should be applied only to the ACN input.
Another set of high gain inputs, DCN and DCP, that have the same gain as for ACN and
ACP, but that are DC coupled to the device input
Jumper JON: install to cause the amplifier to be always "on" since CE is shorted to VDD.
Jumper JCE: Connect the chip enable input to the CE connection point on the PCB. This
is must be installed if an external CE control voltage will be used to control the device.
Jumper JSE: Connect if the device is used in the "single ended" configuration.
VDD or
Ground
Sept, 2010 Rev 1.0 Page 3 / 8
Operations:
Standalone Operations:
Below are four common ways that parts such as the ISD8101 are used in audio circuits. To use
this user guide, it is best to first identify which of these configurations most closely matches the
desired application scenario. Best performance is always achieved by using the differential
configuration, and when this can be used, difficult noise/pop/click issues can be most reduced.
Figure 3: Single-Ended Design Controlled by Chip Enable. Lowest parts count using just one
input, and an external controller manages the Chip Enable CE pin for best performance.
i) Connect jumper JCE, and then CE depends on the CE point control voltage. Thus an
external CE control voltage should be used to control the device.
ii) Connect jumper JSE for single-ended input.
iii) Connect power supply to VDD and ground to VSS.
iv) Connect 8Ω (or larger) load speaker to SPP and SPN.
v) Insert the input audio signal to either Unity Gain Input LPN (0dB gain configuration) or
High Gain Input ACN (20dB gain configuration).
Figure 4: Single-Ended Design, Always-On Case (Chip Enable tied to Vdd). Lowest parts
count using just one input, but no external controller is available to manage the Chip Enable
CE pin. The device is always enabled by connection of the Chip Enable pin directly to Vdd.
i) Connect jumper JON, and thus CE is always ON.
ii) Connect jumper JSE for single-ended input.
iii) Connect power supply to VDD and ground to VSS.
iv) Connect 8Ω (or larger) load speaker to SPP and SPN.
v) Insert the input audio signal to either Unity Gain Input LPN (0dB gain configuration) or
High Gain Input ACN (20dB gain configuration).
Sept, 2010 Rev 1.0 Page 4 / 8
Application Schematic:
R3
0 - 50k
C6
0.01uF -1uF
Vin
C9
0.1uF-4.7uF
INV
VREF
INP
C2
0.1uF C1
Cbulk
Vdd
SPN
5
RL
ISD8101
Ra
5.5k
Rd
55k Rf
Rb
55k
Re
Rc
5.5k
-
+
-
+
-
+
Bias
Generator
4
SPP
Vdd
Vss
6
7
8
1
2
3
Rg
40k
CE
V >1.1V =
Enabled
External
Controller
C1 value range:
10uF to 100uF
100uf is preferred
Figure 3: SINGLE-ENDED DESIGN CONTROLLED BY CHIP ENABLE CASE
R3
0 - 50k
C6
0.01 - 1uF
Vin
C9
0.1uf -4.7uF
INV
VREF
INP
C2
0.1uF C1
Cbulk
Vdd
SPN
5
RL
ISD8101
Ra
5.5k
Rd
55k Rf
Rb
55k
Re
Rc
5.5k
-
+
-
+
-
+
Bias
Generator
4
SPP
Vdd
Vss
6
7
8
1
2
3
Rg
40k
CE
V >1.1V =
Enabled
C1 value range:
10uF to 100uF
100uf is preferred
Vdd
R10
C10
Figure 4: SINGLE-ENDED DESIGN, ALWAYS-ON CASE (CHIP ENABLE TIED TO Vdd)
Sept, 2010 Rev 1.0 Page 5 / 8
Figure 5: Differential Input Design Controlled by Chip Enable. Differential inputs are used,
and are best such as when filtering a PWM (Pulse Width Modulated) signal and handling other
difficult signal input design requirements. An external controller manages Chip Enable.
i) Connect jumper JCE, and then CE depends on the CE point control voltage. Thus
an external CE control voltage should be used to control the device.
ii) Connect power supply to VDD and ground to VSS.
iii) Connect 8Ω (or larger) load speaker to SPP and SPN.
iv) Insert the input audio signal to either Unity Gain Differential Inputs LPN and LPP
(0dB gain configuration) or High Gain Differential Inputs ACN and ACP (20dB
gain configuration).
Figure 6: Differential Input Design, Always-On Case (Chip Enable tied to Vdd). Differential
inputs are used, and are best such as when filtering a PWM (Pulse Width Modulated) signal
and handling other difficult signal input design requirements. No external controller is
available to manage the Chip Enable CE pin. The device is enabled at all times by connection
of the Chip Enable CE pin directly to Vdd.
i) Connect jumper JON, and thus CE is always ON.
ii) Connect power supply to VDD and ground to VSS.
iii) Connect 8Ω (or larger) load speaker to SPP and SPN.
iv) Insert the input audio signal to either Unity Gain Differential Inputs LPN and LPP
(0dB gain configuration) or High Gain Differential Inputs ACN and ACP (20dB gain
configuration).
Sept, 2010 Rev 1.0 Page 6 / 8
C9
0.1uF-4.7uF
VREF
C2
0.1uF C1
Cbulk
Vdd
SPN
RL
ISD8101
Ra
5.5k
Rd
55k Rf
Rb
55k
Re
Rc
5.5k
-
+
-
+
-
+
Bias
Generator
SPP
Vdd
Vss
6
7
8
1
2
3
Rg
40k
CE
V >1.1V =
Enabled
External
Controller
C1 value range:
10uF to 100uF
100uf is preferred
INV
INP
5
4
R3
C6
0.1uF
R6
C7
0.1uF
C5
0.01uF R14
R1
50k
R4
50k
R7
Vinv
Vinp
Figure 5: DIFFERENTIAL INPUT DESIGN CONTROLLED BY CHIP ENABLE CASE
C9
0.1uF-4.7uF
VREF
C2
0.1uF C1
Cbulk
Vdd
SPN
RL
ISD8101
Ra
5.5k
Rd
55k Rf
Rb
55k
Re
Rc
5.5k
-
+
-
+
-
+
Bias
Generator
SPP
Vdd
Vss
6
7
8
1
2
3
Rg
40k
CE
C1 value range:
10uF to 100uF
100uf is preferred
INV
INP
5
4
R3
C6
0.1uF
R6
C7
0.1uF
C5
0.01uF R14
R1
50k
R4
50k
R7
Vinv
Vinp
V >1.1V =
Enabled
Vdd
R10
C10
Figure 6: DIFFERENTIAL INPUT DESIGN, ALWAYS-ON CASE (CHIP ENABLE TIED TO Vdd)
Sept, 2010 Rev 1.0 Page 7 / 8
EVB Schematic:
ACN2
1
TP
C13-NS
C
JCE2
1TP
C2
0.1uF
DCN2
1
TP
ACP1
1
TP
LPP1
1
TP
C4-NS
10pF
VDD2
1
TP
R8
R
C3-NS
33pF
C7
1uF
CE
1
TP
C8-NS
C
JON2
1
TP
C14-NS
22pF
JSE2
1TP
SPP1
1TP
R10
2.2k
C6
1uF
M1
1TP
C9
4.7uF
R11
0-ohm
DCP2
1
TP
VDD
1TP
DCN1
1
TP
R9-NS
R R13-NS
R
LPP2
1
TP
ACP2
1
TP
tGND
1TP
VDD1
1
TP
C10-NS
C
PWR1
1TP
PWR
jumper
tCE
1TP
M2
1TP
JSE
jumper
LPN1
1
TP
VSS2 1
TP
C11-NS
22pF
JON
jumper
R1
50k 1%
SPP2
1TP
SPN2
1TP
tINP
1
TP
R2
0-ohm
R4
50k 1%
JSE1
1
TP
VREF
1TP
R6
0-ohm
VSS1 1
TP
R14-NS
R
C5-NS
C
U1
ISD8101
5
6
4
7
3
2
1
8
9
INV
Vref
INP
CE
VSS
SPP
SPN
VDD
GPAD
DCP1
1
TP
LPN2
1
TP
JON1
1TP
C1
100uF
PWR2
1TP
C12-NS
C tVDD
1TP
R7-NS
R
R12-NS
R
JCE
jumper
JCE1
1TP
R3
0-ohm
tINV 1
TP
R5
0-ohm
SPN1
1TP
C15-NS
22pF
ACN1
1
TP
Sept, 2010 Rev 1.0 Page 8 / 8
VERSION HISTORY
VERSION
DATE
PAGE
DESCRIPTION
Rev. 1.0
Sept 30, 2010
all
Initial Release
Important Notice
Nuvoton products are not designed, intended, authorized or warranted for use as components in systems or
equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship
instruments, transportation instruments, traffic signal instruments, combustion control instruments, or for
other applications intended to support or sustain life. Furthermore, Nuvoton products are not intended for
applications wherein failure of Nuvoton products could result or lead to a situation wherein personal injury,
death or severe property or environmental damage could occur.
Nuvoton customers using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify Nuvoton for any damages resulting from such improper use or sales.
