Micrel, Inc.

MICRF112

December 2011

19

M9999-120911

(408) 944-0800

Tx112-1-315MHz ASK Bill of Materials

Item Quantity

Ref

Part

PCB

Footprint

Mfg P/N

Manufacturer

1

1

C1

10µF

0805

GRM21BR60J106KE01L

muRata

2

1

C2

100pF

0603

GRM1885C1H101JA01D

muRata

3

1

C5

10pF

0603

GRM1885C1H1000JA01D

muRata

4

3

R1,R4,R6

(np)

5

5

C6,C8,C11,C12,C15

(np)

6

1

C7

4.7pF

0603

GRM1885C1H6R8JA01D

muRata

7

1

C10

0.1µF

0603

GRM188F51H104ZA01D

muRata

8

2

C13,C14

18pF

0603

GRM1885C1H180JA01D

muRata

9

2

J1,J2

CON3

TSHR-114-S-02-A-GT

10

1

L1

470nH

0805

0805CS-470XJB

Coilcraft

11

1

L4

150nH

0603

0603CS-R15XJB

Coilcraft

12

1

L5

ANTENNA

ANTENNA LOOP, Part of

PCB

13

1

R2

100kΩ

0603

CRCW0603100KFKEA

Vishay

14

6

R3,R5,R7

R8,JPR1,JPR2

0Ω

0603

CRC06030000Z0EA

Vishay

13

1

U1

MICRF112YMM10

MICRF112YM

Micrel

14

1

Y1

9.84375MHZ

XTAL

SA-9.84375-F-10-C-3-3

HIB

Table 3

FSK Operation

Table 2 and 3 describe the ASK operation for 433.92MHz and 315MHz.

Table 4 lists the component values that change between ASK or FSK operation. Please note that use of a high FSK data

rate may excite parasitic resonant modes with some crystal types. Recommended crystals from Table 2 and 3 are good

for both ASK and FSK.

Mode

R1

R2

R5

R6

JPR1

JPR2

C8

ASK

NP

100kΩ

0Ω

NP

0Ω

NP

NP

FSK

0Ω

NP

NP

100kΩ

NP

0Ω

(1)3.3pF

(2)10pF

Notes:

1. C8 = 3.3pF for 1kHz using HC49/U or HC49US type crystals.

2. C8= 10pF for 10kHz using HC49/U, (high profile) only.

Table 4: ASK and FSK Settings

R3

R4

Constant ON

0Ω

NP

External Standby Control

NP

100kΩ

Table 5: Enable Control (Shutdown)