| 12 Bits R2R Resistor Ladder Network SWR2R-12, FEATURES: Accurate ratio 1:2, High precision thin film resistor network, Cost, space and performance advantage, 12 Bits,Custom pinouts and schematic configurations vailable, Custom resistor values available, APPLICATIONS: Digital to analog (D/A) conversion1 and Analog to digital (A/D) conversion, R2R ladder network is one of the most commonly, simple and inexpensive way to perform digital to analog conversion, using repetitive arrangements of precision resistor networks in a ladder-like configuration. This style resistor network is ideal for digital to analog (D/A)and analog to digital (A/D) conversion. The use of an R-2R ladder architecture is very useful for binary-weighted currents, the R-2R based D/A, A/D converter is easy to implement and the resistance ratio is independent of the number of bits, only the precision of the resistor is significant. Because the resistance of the R2R architecture must be so closely matched (as close as 0.01% for the LSB on an 8-bit DAC) and the current ratio through the switches is still large the implementation of current sources is needed. With equal current flow through all the switches the architecture will be slower but more stable. SEMICONWELL’s thin film R/2R ladder network offers precision, stability, performance and cost-effectiveness compared to discrete components or thick film networks. The typical configuration of the R/2R is an 12 bit ladder network with ±1/2LSB accuracy. Material SiO2 / Silicon 10+/-2mils, Typical Power Rating 50mW@70°C, Tolerances 1%, 0.1%, 0.05%, 0.01%, Capacitance <5pF Resistive material is ultra stable TaN with low TCR <75ppm/°C typical. For Rsq<10Ω/sq and Rsq>500Ω/sq, the resistive material is proprietary. Power rating/resistor max 100mW for R<1KΩ and 25mW for R>1KΩ. Standard tolerance is ±5%. The bonding pads of the resistors are 3µm thick, 99.99% electroplated gold with a TiW barrier that withstands 30 min at 400°C in air without loss of adhesion. Backside of the die is metallized with standard Si/Au compatible with eutectic and epoxy die attach. Custom metallizations are available upon special request for die products only. |
| SEMICONWELL
Integrated Passive Networks |
12 BITS R2R RESISTOR LADDER NETWORK SWR2R-12B |
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| SHORT PRODUCT APPLICATION NOTE |
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R2R ladder network is one of the most commonly, simple and inexpensive way to perform digital to analog conversion, using repetitive arrangements of precision resistor networks in a ladder-like configuration. This style resistor network is ideal for digital to analog (D/A)and analog to digital (A/D) conversion. The use of an R-2R ladder architecture is very useful
for binary-weighted currents, the R-2R based D/A, A/D converter is easy to implement and the resistance ratio is independent of the number of bits, only the precision of the resistor is significant. Because the resistance of the R2R architecture must be so closely matched (as close as 0.01% for the LSB on an 8-bit DAC) and the current ratio through the switches is still large the implementation of current sources is needed. With equal current flow through all the switches the architecture will be
slower but more stable. SEMICONWELL’s thin film R/2R ladder network offers precision, stability, performance and cost-effectiveness compared to discrete components or thick film networks. The typical configuration of the R/2R is an 12 bit ladder network with ±1/2LSB accuracy. |
| SEMICONDUCTOR-THIN FILM MANUFACTURING PROCESS DESCRIPTION |
| Integrated passive networks are manufactured using advanced thin film technologies including ultra -stable and self passivating Tantalum Nitride resistors, gold interconnect metallization and reliable MNOS capacitors to achieve excellent uniformity, performance and reliability. Thin film resistor technology is the preferred solution for all applications that require low noise, long term stability and excellent performance at very high frequencies. Semiconwell employs proprietary thin film technologies for deposition of a wide range of sheet resistance films from 1 Ω/sq to 10,000 Ω/sq. All Semiconwell's products are available in die form and as KGD, known good die and are ideal for high reliability hybrid and multi chip module applications. Besides thin film resistors, Semiconwell integrates capacitors, Schottky diodes, Zener diodes and transistors. Integrated passive and active networks are manufactured using Semiconwell's in house high reliability semiconductor manufacturing processes. All semiconductor devices employ precision doping via ion implantation, silicon nitride junction passivation, platinum silicided contacts and gold interconnect metallization for best performance and reliability. MNOS capacitors and Tantalum Nitride resistors are easily integrated with Schottky diodes to provide complete standard and custom RCD solutions. In die form, these products are ideal for hybrid and multi chip module applications. In packaged form, these products are the best solution where space and weight are a concern. |
| RESISTOR SPECIFICATIONS | ||
| Capacitance [pF] | Tolerance q [%] | Power Rating [mW] |
| <5pF | 1, 0.1, 0.05, 0.01 | 50 mW@70°C |
| Stresses beyond listed absolute maximum ratings may cause permanent damage to the device. |
| GENERAL DIE INFORMATION | ||||
| Substrate | Thickness (mils) | Die size (mils) | Bonding pads | Backside metal |
| SiO2 / Silicon | 10±2 | XX x YY±3 | 4x4 mils, 3mm thick, 99.99% electroplated gold with a TiW barrier | Au/Si compatible with eutectic and conductive epoxy die attach. |
| All Semiconwell products are available in die form for chip and wire hybrid circuits and multi chip modules applications. Typical delivery for standard die products is 3-4 weeks ARO. For Chip Scale Packaged (CSP) devices consult factory for an update on availability of certain products. | ||||
| CONDUCTORS | RESISTORS | BACKSIDE METAL |
| The bonding pads of the resistors are 3µm thick, 99.99% electroplated gold with a TiW barrier that withstands 30 min at 400°C in air without loss of adhesion. | Resistive material is ultra stable TaN with low TCR <75ppm/°C typical. For Rsq<10Ω/sq and Rsq>500Ω/sq, the resistive material is proprietary. Power rating/resistor max 100mW for R<1KΩ and 25mW for R>1KΩ. Standard tolerance is ±5%. | Backside of the die is metallized with standard Si/Au compatible with eutectic and epoxy die attach. Custom metallizations are available upon special request for die products only. |
| PACKAGE PIN OUT | ||
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| STANDARD PRODUCTS ORDERING INFORMATION |
| SW PART # | QUANTITY | QSOP-24 | U/P($) | TQSOP-24 | U/P($) | TSSOP-24 | U/P($) | BARE DIE | U/P($) |
| SWR2R-12B/RCODE-1% | 5,000pc | -24QS | -24TQS | -24TS | -24BD | ||||
| SWR2R-12B/RCODE-1% | 10,000pc | -24QS | -24TQS | -24TS | -24BD | ||||
| For custom products sold as bare tested die or known good die KGD, minimum order is 5000pc. Dice are 100% functional tested, visual inspected and shipped in antistatic waffle packs. For special die level KGD requirements, different packaging or custom configurations, contact sw_sales@semiconwell.com | |||||||||
| Delivery for packaged Resistor networks standard products is 4-6 weeks ARO. Certain items may be available from stock. For standard products available from stock, there is a minimum line item order of $250.0. Inventory is periodically updated. For 2500pc or larger orders, all surface mount packaged devices are shipped in tape on reel (T/R). For smaller quantities, it may vary. Samples are available only for customers that have issued firm orders pending qualification of product in a particular application. On line Orders have to be verified, accepted and acknowledged by Semiconwell sales department in writing before, becoming non cancelable binding contracts. |
| Semiconwell guarantees continuous supply and availability of any of it's standard products provided minimum order quantities are met. |
| SEMICONWELL has made every effort to have this information as accurate as possible. However, no responsibility is assumed by SEMICONWELL for its use, nor for any infringements of rights of third parties which may result from its use. SEMICONWELL reserves the right to revise the content or modify its product line without prior notice. SEMICONWELL products are not authorized for and should not be used within support systems which are intended for surgical implants into the body, to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without the specific written consent. |
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